Introduction: An Assessment of U.S. Military Power

An Assessment of U.S. Military Power

Introduction: An Assessment of U.S. Military Power

Oct 20, 2021 43 min read

An Assessment of U.S. Military Power
The aircraft carrier USS Ronald Reagan leads a formation of Carrier Strike Group Five ships as Air Force B-52 Stratofortress aircraft and Navy F/A-18 Hornet aircraft pass overhead. U.S. Navy photo by Erwin Miciano

Because America is a global power with global interests, its military is tasked first and foremost with defending the country from attack. Beyond that, it must be capable of protecting Americans abroad, America’s allies, and the freedom to use international sea, air, space, and cyberspace while retaining the ability to engage in more than one major contingency at a time. America must be able not only to defend itself and its interests, but also to deter enemies and opportunists from taking action that would challenge U.S. interests—a capability that includes both preventing the destabilization of a region and guarding against threats to the peace and security of America’s friends.

As noted in all preceding editions of the Index, however, the U.S. does not have the necessary force to meet a two–major regional contingency (two-MRC) requirement and is not ready to carry out its duties effectively. Consequently, as we have seen during the past few years, the U.S. finds itself increasingly challenged by major competitors such as China and Russia and the destabilizing effects of terrorist and insurgent elements operating in regions that are of substantial interest to the U.S.

During 2020, SARS-CoV-2, the virus that causes the COVID-19 disease, affected the military services in ways that were similar to how it affected the population generally.

  • Training was curtailed in order to minimize the transmission of the virus within the force by keeping servicemembers as separated as possible;
  • Exercises with allies and other security partners were canceled or reduced in scope; and
  • Military resources, especially in the medical community, were redirected to support civilian efforts to deal with the spreading pandemic through the construction and staffing of field hospitals and the distribution and administering of vaccines.

This situation took a toll on some aspects of conventional readiness across the force, but it also provided an opportunity—albeit unwanted—for the military to practice existing protocols for dealing with infectious disease and develop new methods for training and education, conducting exercises under restricted conditions, and maintaining operational efforts abroad in spite of the pandemic. Similar pandemic-related problems confronted all elements of the defense industrial base and the full range of supply, maintenance, and transportation activities across the military and civilian, government, and private sectors that are essential to maintaining a viable military enterprise.

Viewed through the lenses of readiness, the potential requirement to surge operations in war, or the need to adjust practices to counter an enemy attack, responding to the COVID-19 challenge served as an important learning opportunity. Whether the military services, the Department of Defense (DOD), the Administration and Congress, and civilian firms supporting defense programs internalize such lessons remains to be seen. For 2021, it is reasonable to assume that the U.S. military gained as much as, if not more than, it lost with regard to wartime readiness.

How to Think About Sizing Military Power

Military power consists of many things and is the result of how all of its constituent pieces are brought together to create an effective warfighting force, but it begins with the people and equipment used to conduct war: the weapons, tanks, ships, airplanes, and supporting tools such as communications systems that make it possible for one group either to impose its will on another or to prevent such an outcome from happening, which is the point of deterrence.

However, simply counting the number of people, tanks, or combat aircraft that the U.S. possesses would be insufficient because it would lack context. For example, the U.S. Army might have 100 tanks, but to accomplish a specific military task, 1,000 or more might be needed or none at all. It might be that the terrain on which a battle is fought is especially ill-suited to tanks or that the tanks one has are inferior to the enemy’s. The enemy could be quite adept at using tanks, or his tank operations might be integrated into a larger employment concept that leverages the supporting fires of infantry and airpower, whereas one’s own tanks are poorly maintained, the crews are not well prepared, or one’s doctrine is irrelevant.

Success in war is partly a function of matching the tools of warfare to a specific task and employing those tools effectively in battle. Get these wrong—tools, objective, competence, or context—and you lose.

Another key element is the military’s capacity to conduct operations: how many of the right tools—people, tanks, planes, or ships—it has. One might have the right tools and know how to use them effectively but not have enough to win. Because one cannot know with certainty beforehand just when, where, against whom, and for what reason a battle might be fought, determining how much capability is needed is an exercise that requires informed but not certain judgment.

Further, two different combatants can use the same set of tools in radically different ways to quite different effects. The concept of employment matters. Concepts are developed to account for numbers, capabilities, material readiness, and all sorts of other factors that enable or constrain one’s actions, such as whether one fights alone or alongside allies, on familiar or strange terrain, or with a large, well-equipped force or a small, poorly equipped force. A thinking adversary will analyze his opponent for weaknesses or patterns of behavior and seek to develop techniques, approaches, and tools that exploit such shortfalls or predictable patterns—the asymmetries of war. One need not try to match an enemy tank for tank: In many cases, not trying is more effective.

All of these factors and a multitude of others affect the outcome of any military contest. Military planners attempt to account for them when devising requirements, developing training and exercise plans, formulating war plans, and advising the President in his role as Commander in Chief of U.S. military forces.

Measuring hard combat power in terms of its capability, capacity, and readiness to defend U.S. vital interests is difficult, especially in such a limited space as this Index, but it is not impossible. However difficult determining the adequacy of one’s military forces may be, the Secretary of Defense and the military services have to make such decisions every year when the annual defense budget request is submitted to Congress.

The adequacy of hard power is affected most directly by the resources the nation is willing to apply. Although that decision is informed to a significant degree by an appreciation of threats to U.S. interests and the ability of a given defense portfolio to protect U.S. interests against such threats, it is not informed solely by such considerations; hence the importance of clarity and honesty in determining exactly what is needed in terms of hard power and the status of such power from year to year.

Administrations take various approaches in determining the type and amount of military power needed and, by extension, the amount of money and other resources that will be necessary to support that power. After defining the national interests to be protected, the DOD can use worst-case scenarios to determine the maximum challenges the U.S. military might have to overcome. Another way is to redefine what constitutes a threat. By taking a different view of whether major actors pose a meaningful threat and of the extent to which friends and allies have the ability to assist the U.S. in meeting security objectives, one can arrive at different conclusions about the necessary level of military strength.

For example, one Administration might view China as a rising belligerent power bent on dominating the Asia–Pacific region. Another Administration might view China as an inherently peaceful rising economic power and the expansion of its military capabilities as a natural occurrence commensurate with its strengthening status. There can be dramatically different perspectives with respect to how China might use its military power and what would constitute an effective U.S. response. The difference between these views can have a dramatic impact on how one thinks about U.S. defense requirements. So, too, can policymakers amplify or downplay risk to justify defense budget decisions.

There also can be strongly differing views on requirements for operational capacity.

  • Does the country need enough for two major combat operations (MCOs) at roughly the same time or just enough for a single major operation and some number of lesser cases?
  • To what extent should “presence” tasks—the use of forces for routine engagement with partner countries or simply to be on hand in a region for crisis response—be in addition to or a subset of a military force sized to handle two major regional conflicts?
  • How much value should be assigned to advanced technologies as they are incorporated into the force?
  • What is the likelihood of conventional war and, if one thinks it unlikely, what level of risk is one willing to accept that sufficient warning will allow for rearming?

Where to Start

There are two major references that one can use to help sort through the variables and arrive at a starting point for assessing the adequacy of today’s military posture: government studies and historical experience. The government occasionally conducts formal reviews that are meant to inform decisions on capabilities and capacities across the Joint Force relative to the threat environment (current and projected) and evolutions in operating conditions, the advancement of technologies, and aspects of U.S. interests that may call for one type of military response over another.

The 1993 Bottom-Up Review (BUR) conducted by then-Secretary of Defense Les Aspin is one example frequently cited by analysts. Secretary Aspin recognized that “the dramatic changes that [had] occurred in the world as a result of the end of the Cold War and the dissolution of the Soviet Union” had “fundamentally altered America’s security needs” and were driving an imperative “to reassess all of our defense concepts, plans, and programs from the ground up.”1

The BUR formally established the requirement that U.S. forces should be able “to achieve decisive victory in two nearly simultaneous major regional conflicts and to conduct combat operations characterized by rapid response and a high probability of success, while minimizing the risk of significant American casualties.”2 Thus was formalized the two-MRC standard.

Since that study, the government has undertaken others as Administrations, national conditions, and world events have changed the context of national security. Quadrennial Defense Reviews (QDRs) were conducted in 1997, 2010, and 2014, accompanied by independent National Defense Panel (NDP) reports that reviewed and commented on them. Both sets of documents purported to serve as key assessments, but analysts came to minimize their value, regarding them as justifications for executive branch policy preferences (the QDR reports) or overly broad generalized commentaries (the NDP reports) that lack substantive discussion about threats to U.S. interests, a credible strategy for dealing with them, and the actual ability of the U.S. military to meet national security requirements.

The QDR was replaced by the National Defense Strategy (NDS), released in 2018, and the independent perspectives of the formal DOD review by the National Defense Strategy Commission, which released its view of the NDS in November 2018. Departing from their predecessors, neither document proposed specific force structures or end strength goals for the services,3 but both were very clear in arguing the need to be able to address more than one major security challenge at a time. The commission’s report went so far as to criticize the NDS for not making a stronger case for a larger military that would be capable of meeting the challenges posed by four named competitors—China, Russia, Iran, and North Korea—while also possessing the capacity to address lesser, though still important, military tasks that included presence, crisis response, and assistance missions.

Though the Biden Administration has not yet produced a national defense strategy to replace the one issued by the Trump Administration in 2018, its Interim National Security Strategic Guidance (INNSG) echoes the general goal for the U.S. military to “deter and prevent adversaries from directly threatening the United States and our allies, inhibiting access to the global commons, or dominating key regions,”4 themes that have remained remarkably consistent from one Administration to the next for several decades. Taken at face value and considering the challenges posed simultaneously by a multitude of competitors in several regions, the INSSG seems to imply that the military should have the capability and capacity to meet this objective.

Correlation of Forces as a Factor in Force Sizing

During the Cold War, the U.S. used the Soviet threat as its primary reference in determining its hard-power needs. At that time, the correlation of forces—a comparison of one force against another to determine strengths and weaknesses—was highly symmetrical. U.S. planners compared tanks, aircraft, and ships against their direct counterparts in the opposing force. These comparative assessments drove the sizing, characteristics, and capabilities of fleets, armies, and air forces.

The evolution of guided, precision munitions and the rapid technological advancements in surveillance and targeting systems since the late 1980s have made comparing combat power more difficult. What was largely a platform-versus-platform model has shifted somewhat to a munitions-versus-target model.

The proliferation of precise weaponry means increasingly that each round, bomb, rocket, missile, and even (in some instances) individual bullet can hit its intended target, thus decreasing the number of munitions needed to prosecute an operation. It also means that the lethality of an operating environment increases significantly for the people and platforms involved. We have reached the point at which, instead of focusing primarily on how many ships or airplanes the enemy can bring to bear against one’s own force, one must consider how many “smart munitions” the enemy has when thinking about how many platforms and people are needed to win a combat engagement.5 The increasing presence of unmanned systems that can deliver precision-guided munitions against targets adds complexity and danger to the modern battlefield.

In one sense, increased precision and the technological advances now being incorporated into U.S. weapons, platforms, and operating concepts make it possible to do far more than ever before with fewer assets.

  • Platform signature reduction (stealth) makes it harder for the enemy to find and target them, and the increased precision of weapons makes it possible for fewer platforms to hit many more targets.
  • The ability of the U.S. military to harness computers, modern telecommunications, space-based platforms—such as for surveillance, communications, and positioning-navigation-timing (PNT) support from GPS satellites—and networked operations potentially means that in certain situations, smaller forces can have far greater effect in battle than at any other time in history (although these same advances also enable enemy forces).
  • Some military functions—such as seizing, holding, and occupying territory—may require a certain number of soldiers no matter how state-of-the-art their equipment may be. For example, the number of infantry squads needed to secure an urban area where line of sight is constrained and precision weapons have limited utility is the same as the number needed in World War II.

Regardless of the improved capability of smaller forces, there is a downside to fewer numbers. With smaller forces, each element of the force represents a greater percentage of its combat power. Each casualty or equipment loss therefore takes a larger toll on the ability of the force to sustain high-tempo, high-intensity combat operations over time, especially if the force is dispersed across a wide theater or multiple theaters of operation.

As advanced technology has become more affordable, it has become more accessible for nearly any actor, whether state or non-state.6 Consequently, it may well be that the outcomes of future wars will depend far more on the skill of the forces and their capacity to sustain operations over time than they will on some great disparity in technology. If so, readiness and capacity will become more important than absolute advances in capability.

All of this illustrates the difficulties of and need for exercising judgment in assessing the adequacy of America’s military power. Yet without such an assessment, all that remains are the defense strategy reviews, which are subject to filtering and manipulation to suit policy interests; annual budget submissions, which typically favor desired military programs at presumed levels of affordability and are therefore necessarily budget-constrained; and leadership posture statements, which often simply align with executive branch policy priorities.

The U.S. Joint Force and the Art of War

This section of the Index assesses the adequacy of America’s defense posture as it pertains to a conventional understanding of hard power, defined as the ability of American military forces to engage and defeat an enemy’s forces in battle at a scale commensurate with the vital national interests of the U.S. While some hard truths in military affairs are appropriately addressed by mathematics and science, others are not. Speed, range, probability of detection, and radar cross-section are examples of quantifiable characteristics that can be measured. Specific future instances in which U.S. military power will be needed, the competence of the enemy, the political will to sustain operations in the face of mounting deaths and destruction, and the absolute amount of strength needed to win are matters of judgment and experience, but they nevertheless affect how large and capable a force one might need.

In conducting the assessment, we accounted for both quantitative and qualitative aspects of military forces, informed by an experience-based understanding of military operations and the expertise of external reviewers. The authors of these military sections bring a combined total of more than a hundred years of uniformed military experience to their analysis.

Military effectiveness is as much an art as it is a science. Specific military capabilities represented in weapons, platforms, and military units can be used individually to some effect. Practitioners of war, however, have learned that combining the tools of war in various ways and orchestrating their tactical employment in series or simultaneously can dramatically amplify the effectiveness of the force that is committed to battle.

Employment concepts are exceedingly hard to measure in any quantitative way, but their value as critical contributors in the conduct of war is undeniable. How they are used is very much an art-of-war matter that is learned through experience over time.

What Is Not Being Assessed

In assessing the current status of the military forces, this Index uses the primary measures used by the military services themselves when they discuss their ability to employ hard combat power.

  • The Army’s unit of measure is the brigade combat team (BCT);
  • The Marine Corps structures itself by battalions;
  • For the Navy, it is the number of ships in its combat fleet; and
  • The most consistent measure for the Air Force is total number of aircraft, sometimes broken down into the two primary subtypes of fighters and bombers.

Obviously, this is not the totality of service capabilities, and it certainly is not everything needed for war, but these measures can be viewed as surrogates that subsume or represent the vast number of other things that make these units of measure possible and effective in battle. For example, combat forces depend on a vast logistics system that supplies everything from food and water to fuel, ammunition, and repair parts. Military operations require engineer support, and the force needs medical, dental, and administrative capabilities. The military also fields units that transport combat power and its sustainment to wherever they may be needed around the world.

The point is that the military spear has a great deal of shaft that makes it possible for the tip to locate, close with, and destroy its target, and there is a rough proportionality between shaft and tip. Thus, in assessing the basic units of measure for combat power, one can get a sense of what is probably needed in the combat support, combat service support, and supporting establishment echelons.

The scope of this Index does not extend to analysis of everything that makes hard power possible; it focuses on the status of the hard power itself. It also does not assess the services’ Reserve and National Guard components, although they account for roughly one-third of the U.S. military force and have been essential to the conduct of operations since September 2001.7 Consistent assessment of their capability, readiness, and operational role is challenging because each service determines the balance among its Active, Reserve, and National Guard elements differently: Only the Army and Air Force have Guard elements; the Navy and Marine Corps do not. This balance can change from year to year and is based on factors that include cost of the respective elements, availability for operational employment, time needed to respond to an emergent crisis, allocation of roles among the elements, and political considerations.8

As with other elements essential to the effective employment of combat power—logistics, medical support, strategic lift, training, etc.—the U.S. military could not handle a major conflict without the Reserve and Guard forces. Nevertheless, to make the challenge of annually assessing the status of U.S. military strength using consistent metrics over time more manageable, this Index looks at something that is usually associated with the Active component of each service: the baseline requirement for a given amount of combat power that is readily available for use in a major combat operation. There are exceptions, however. For example, in the 2020 Index, four Army National Guard BCTs were counted as “available” for use because of the significant amounts of additional resources that had been dedicated specifically to these formations to raise their readiness levels.9

The Defense Budget and Strategic Guidance

When it comes to the defense budget, how much we spend does not automatically determine the U.S. military’s posture or capacity. As a matter of fact, simply looking at how much is allocated to defense does not tell us much about the capacity, modernity, or readiness of the forces. Proper funding is a necessary condition for a capable, modern, and ready force, but it is not sufficient by itself. A larger defense budget, for example, could be associated with less military capability if the money were allocated inappropriately or spent wastefully. Nevertheless, the budget does reflect the importance assigned to defending the nation and its interests in prioritizing federal spending.

Absent a significant threat to the country’s survival, the U.S. government will always balance spending on defense against spending in all of the other areas of government activity that are deemed necessary or desirable. Ideally, defense requirements are determined by identifying national interests that might need to be protected with military power; assessing the nature of threats to those interests, what would be needed to defeat those threats, and the costs associated with that capability; and then determining what the country can afford or is willing to spend. Any difference between assessed requirements and affordable levels of spending on defense would constitute a risk to U.S. security interests.

This Index enthusiastically adopts this approach: interests, threats, requirements, resulting force, and associated budget. Spending less than the amount needed to maintain a two-MRC force results in policy debates about where to accept risk: force modernization, the capacity to conduct large-scale or multiple simultaneous operations, or force readiness. The composition of the force and the understanding of military risk have become more salient issues with the shift toward competition with China and Russia. Both the 2017 National Security Strategy10 and the 2021 Interim National Security Guidance11 recognize that meeting the challenges posed by these two large, well-equipped, and well-resourced countries requires a U.S. force that is modern, ready, and effective in all domains of warfare.

The decision to fund national defense at a level that is commensurate with interests and prevailing threats reflects our national priorities and risk tolerance. This Index assesses the ability of the nation’s military forces to protect vital national security interests within the world as it is so that the debate about the level of funding for hard power is better informed.

The fiscal year (FY) 2021 base discretionary budget for the Department of Defense was $703.7 billion.12 This represents the resources allocated to pay for the forces (manpower, equipment, and training); enabling capabilities (things like transportation, satellites, defense intelligence, and research and development); and institutional support (bases and stations, facilities, recruiting, and the like). The base budget has not paid for the cost of major ongoing overseas operations, which are captured in supplemental funding known as OCO (overseas contingency operations).

FY 2021 was the last year that was heavily shaped by two budgetary instruments: OCO and the Budget Control Act (BCA) of 2011.13 The OCO account was created in the immediate aftermath of the September 11, 2001, terrorist attacks to provide the resources needed to prosecute the war on terrorism.14 Since then, the account has ebbed and flowed depending on political and fiscal concerns in Congress and operational realities on the battlefields. The account is set to be merged into the base budget by the Biden Administration starting in FY 2022.15

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Passage of the BCA established legal limits on the funds dedicated to the budget, including defense. That prompted Congress to use OCO as an escape valve for artificially low defense budgets.16 In this regard, for the past decade, the level of funding for defense has been determined by the politics surrounding the BCA. Despite repeated emphasis on the importance of investing more to fix obvious readiness, capacity, and modernization problems, the debate has been determined by larger political dynamics that pit those who want to see an overall reduction in federal spending against those who advocate higher levels of defense spending and those who want to see any increase in defense spending matched by commensurate increases in domestic spending.

This dynamic shaped the defense spending debate until FY 2021, the last year within the BCA framework. As Congress and the DOD move into a new budgetary reality, there will be an opportunity to explain the challenges that lie ahead both for the U.S. military and for America’s national interests.

Senior DOD leaders have expressed the need for more funding to meet the challenge of a more capable and aggressive China and Russia since well before the release of the 2018 NDS. Testifying before the House Armed Services Committee in 2017, both then-Secretary of Defense James N. Mattis and then-Chairman of the Joint Chiefs of Staff General Joseph Dunford emphasized the need for sustained budget growth so that U.S. forces can maintain a competitive advantage over likely adversaries. Secretary Mattis said that “he expect[ed] to ask for base budget growth ‘along the lines of close to 5 percent growth, 3 to 5 percent growth for 2019 to ’23,” and General Dunford stated that “[w]e know now that continued growth in the base budget of at least 3 percent above inflation is the floor necessary to preserve just the competitive advantage we have today, and we can’t assume our adversaries will remain still.”17

The bipartisan commission that assessed the National Defense Strategy also assessed the need for budgetary growth of between 3 percent and 5 percent above inflation,18 and this recommendation was sustained by former Secretary of Defense Mark Esper.19

Unfortunately, over the past five fiscal years, the DOD has seen a swing when it comes to real growth in its budget authority (i.e., budgets that account for the effect of inflation). From 2017 to 2019, there was significant real growth of 3 percent followed by 8.4 percent and 0.3 percent. However, that was followed by two years of real decline of 1 percent in 2020 and then 2.8 percent in 2021. Further, the latest projection of defense budgets anticipates negative growth of 0.1 percent in the coming years.20 That is a far cry from the steady above-inflation increase that was seen as necessary by bipartisan leaders.

Adding to future challenges, the federal government’s response to the coronavirus pandemic could influence how the defense budget is discussed and appropriated in future fiscal years. The Congressional Budget Office highlighted a $3 trillion deficit for FY 2020 and a second $3 trillion deficit for FY 2021 in its most recent outlook on the budget and the economy.21 This extremely high level of budgetary deficit will undoubtedly shape how the country assesses the federal government’s budgetary priorities, especially when added to the already massive national debt that approached $27 trillion by the end of 2020,22 and demand adjustments in the federal government’s allocations of taxpayers’ dollars.

Purpose as a Driver in Force Sizing

The Joint Force is used for a wide range of purposes, only one of which is major combat operations. Fortunately, such events have been relatively rare, although they have occurred every 15 years on average.23 In between (and even during) such occurrences, the military is used to support regional engagement, crisis response, strategic deterrence, and humanitarian assistance as well as to support civil authorities and U.S. diplomacy.

All of the U.S. Unified Geographic Combatant Commands, or COCOMS24—Northern Command (NORTHCOM); European Command (EUCOM); Central Command (CENTCOM); Indo-Pacific Command (INDOPACOM); Southern Command (SOUTHCOM); and Africa Command (AFRICOM)—have annual and long-term plans through which they engage with countries in their assigned regions. Engagements range from very small unit training events with the forces of a single partner country to larger bilateral and sometimes multilateral military exercises. Such events help to foster working relationships with other countries, acquire a more detailed understanding of regional political–military dynamics and on-the-ground conditions in areas of interest, and signal U.S. security interests to friends and competitors.

To support such COCOM efforts, the services provide forces that are based permanently in their respective regions or that operate in them temporarily on a rotational basis. To make these regional rotations possible, the services must maintain base forces that are large enough to train, deploy, support, receive back, and again make ready a stream of units that ideally is enough to meet validated COCOM demand.

The ratio between time spent at home and time spent away on deployment for any given unit is known as OPTEMPO (operational tempo), and each service attempts to maintain a ratio that both gives units enough time to educate, train, and prepare their forces and allows the individuals in a unit to maintain some semblance of a healthy home and family life. This ensures that units are fully prepared for the next deployment cycle and that servicemembers do not become “burned out” or suffer adverse consequences in their personal lives because of excessive deployment time.

Experience has shown that a ratio of at least 3:1 (three periods of time at home for every period deployed) is sustainable. If a unit is to be out for six months, for example, it will be home for 18 months before deploying again. Obviously, a service needs enough people, units, ships, and planes to support such a ratio. If peacetime engagement were the primary focus for the Joint Force, the services could size their forces to support these forward-based and forward-deployed demands.

Thus, the size of the total force must necessarily be much larger than any sampling of its use at any point in time.

In contrast, sizing a force for major combat operations is an exercise informed by history—how much force was needed in previous wars—and then shaped and refined by analysis of current threats, a range of plausible scenarios, and expectations about what the U.S. can do given training, equipment, employment concept, and other factors. The defense establishment must then balance “force sizing” between COCOM requirements for presence and engagement and the amount of military power (typically measured in terms of combat units and major combat platforms, which inform total end strength) that is thought necessary to win in likely war scenarios.

Inevitably, compromises are made that account for how much military the country is willing to buy. Generally speaking:

  • The Army sizes to major warfighting requirements;
  • The Marine Corps focuses on crisis response demands and the ability to contribute to one major war;
  • The Air Force attempts to strike a balance that accounts for historically based demand across the spectrum because air assets are shifted fairly easily from one theater of operations to another (“easily” being a relative term when compared to the challenge of shifting large land forces), and any peacetime engagement typically requires some level of air support; and
  • The Navy is driven by global presence requirements. To meet COCOM requirements for a continuous fleet presence at sea, the Navy must have three to four ships in order to have one on station. A commander who wants one U.S. warship stationed off the coast of a hostile country, for example, needs the use of four ships from the fleet: one on station, one that left station and is traveling home, one that just left home and is traveling to station, and one that is otherwise unavailable because of major maintenance or modernization work.

This Index focuses on the forces required to win two major wars as the baseline force-sizing metric for the Army, Navy, and Air Force and the one-war-plus-crisis-response paradigm for the Marine Corps. The three large services are sized for global action in more than one theater at a time; the Marines, by virtue of overall size and most recently by direction of the Commandant, focus on one major conflict while ensuring that all Fleet Marine Forces are globally deployable for short-notice, smaller-scale actions.25 The military’s effectiveness, both as a deterrent against opportunistic competitor states and as a valued training partner in the eyes of other countries, derives from its effectiveness (proven or presumed) in winning wars.

Our Approach

With this in mind, we assessed the state of America’s military forces as it pertains to their ability to deliver hard power against an enemy in three areas:

  • Capability,
  • Capacity, and
  • Readiness.

Capability. Examining the capability of a military force requires consideration of:

  • The proper tools (material and conceptual) with the design, performance characteristics, technological advancement, and suitability that the force needs to perform its function against an enemy successfully;
  • The sufficiency of armored vehicles, ships, airplanes, and other equipment and weapons to win against the enemy;
  • The appropriate variety of options to preclude strategic vulnerabilities in the force and give flexibilities to battlefield commanders; and
  • The degree to which elements of the force reinforce each other in covering potential vulnerabilities, maximizing strengths, and gaining greater effectiveness through synergies that are not possible in narrowly stovepiped, linear approaches to war.

The capability of the U.S. Joint Force was on ample display in its decisive conventional war victory over Iraq in liberating Kuwait in 1991 and later in the conventional military operation in Iraq to depose Saddam Hussein in 2003. Aspects of its capability have also been seen in numerous other operations undertaken since the end of the Cold War. While the conventional combat aspect of power projection has been more moderate in places like Yugoslavia, Somalia, Bosnia and Serbia, and Kosovo, and even against the Taliban in Afghanistan in 2001, the fact that the U.S. military was able to conduct highly complex operations thousands of miles away in austere, hostile environments and sustain those operations as long as required is testament to the ability of U.S. forces to do things that the armed forces of few if any other countries can do.

A modern “major combat operation”26 along the lines of those upon which Pentagon planners base their requirements would feature a major opponent possessing modern integrated air defenses; naval power (surface and undersea); advanced combat aircraft (to include bombers); a substantial inventory of short-range, medium-range, and long-range missiles; current-generation ground forces (tanks, armored vehicles, artillery, rockets, and anti-armor weaponry); cruise missiles; and (in some cases) nuclear weapons. Such a situation involving an actor capable of threatening vital national interests would present a challenge that is comprehensively different from the challenges that the U.S. Joint Force has faced in past decades.

Since 2018, given its focus on counterinsurgency, stability, and advise-and-assist operations since 2004 and the 2018 NDS directive to prepare for conflict in an era of great-power competition, the military community has focused on its suitability and readiness for major conventional warfare.27 The Army in particular has noted the need to reengage in training and exercises that feature larger-scale combined arms maneuver operations, especially to ensure that its higher headquarters elements are up to the task.

This Index ascertains the relevance and health of military service capabilities by looking at such factors as average age of equipment, generation of equipment relative to the current state of competitor efforts as reported by the services, and the status of replacement programs that are meant to introduce more updated systems as older equipment reaches the end of its programmed service life. While some of the information is quite quantitative, other factors could be considered judgment calls made by acknowledged experts in the relevant areas of interest or addressed by senior service officials when providing testimony to Congress or examining specific areas in other official statements.

It must be determined whether the services possess capabilities that are relevant to the modern combat environment.

Capacity. The U.S. military must have a sufficient quantity of the right capability or capabilities. When speaking of platforms such as planes and ships, a troubling and fairly consistent trend within U.S. military acquisition characterizes the path from requirement to fielded capability. Along the way to acquiring the capability, several linked things happen that result in far less of a presumed “critical capability” than was supposedly required.

  • The military articulates a requirement that the manufacturing sector attempts to satisfy.
  • “Unexpected” technological hurdles arise that take longer and much more money to solve than anyone envisioned.
  • Programs are lengthened, and cost overruns are addressed, usually with more money.
  • Then the realization sets in that the country either cannot afford or is unwilling to pay the cost of acquiring the total number of platforms originally advocated. The acquisition goal is adjusted downward, if not canceled altogether, and the military finally fields fewer platforms at a higher cost per unit than it originally said it needed to be successful in combat.

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As deliberations proceed toward a decision on whether to reduce planned procurement, they rarely focus on and quantify the increase in risk that accompanies the decrease in procurement.

Something similar happens with force structure size: the number of units and total number of personnel the services say they need to meet the objectives established by the Commander in Chief and the Secretary of Defense in their strategic guidance.

  • The Marine Corps has stated that it needs 27 infantry battalions to fully satisfy the validated requirements of the regional Combatant Commanders, yet it currently fields only 24 and has stated that it plans to drop to 21 in order to make resources available for experimentation and modernization.28
  • In 2012, the Army was building toward 48 brigade combat teams, but incremental budget cuts reduced that number over time to 31—less than two-thirds the number that the Army originally thought was necessary.
  • The Navy has produced various assessments of fleet size since the end of the Cold War, from 313 ships to 372 ships, with some working estimates as high as 500 manned ships.

Older equipment can be updated with new components to keep it relevant, and commanders can employ fewer units more expertly for longer periods of time in an operational theater to accomplish an objective. At some point, however, sheer numbers of updated, modern equipment and trained, fully manned units are going to be needed to win in battle against a credible opponent when the crisis is profound enough to threaten a vital national interest.

Capacity (numbers) can be viewed in at least three ways: compared to a stated objective for each category by each service, compared to amounts required to complete various types of operations across a wide range of potential missions as measured against a potential adversary, and as measured against a set benchmark for total national capability. This Index employs the two-MRC metric as a benchmark for most of the force.

The two-MRC benchmark for force sizing is the minimum standard for U.S. hard-power capacity because one will never be able to employ 100 percent of the force at any given time. Some percentage of the force will always be unavailable because of long-term maintenance overhaul, especially for Navy ships; unit training cycles; employment in myriad engagement and small-crisis response tasks that continue even during major conflicts; a standing commitment with allies to maintain U.S. forces in a given country or region; and the need to keep some portion of the force uncommitted to serve as a strategic reserve.

The historical record shows that, on average, the U.S. Army commits 21 BCTs to a major conflict; thus, a two-MRC standard would require that 42 BCTs be available for actual use. But an Army built to field only 42 BCTs would also be an Army that could find itself entirely committed to war, leaving nothing back as a strategic reserve to replace combat losses or to handle other U.S. security interests. Although new technologies and additional capabilities have made current BCTs more capable than those they replaced, one thing remains the same: Today’s BCT, like its predecessors, can be committed to only one place at a time and must be able to account for combat losses, especially if it engages a similarly modernized enemy force. Thus, numbers still matter regardless of modernity.

Again, this Index assesses only the Active component of the service, albeit with full awareness that the Army also has Reserve and National Guard components that together account for half of the total Army. The additional capacity needed to meet these “above two-MRC requirements” could be handled by these other components or mobilized to supplement Active-component commitments. In fact, this is how the Army thinks about meeting operational demands and is at the heart of the long-running debate within the total Army about the roles and contributions of the various Army components. A similar situation exists with the Air Force and Marine Corps.

The balance among Active, Reserve, and Guard elements is beyond the scope of this study. Our focus is on establishing a minimum benchmark for the capacity needed to handle a two-MRC requirement.

We conducted a review of the major defense studies (1993 BUR, QDR reports, and independent panel critiques) that are publicly available,29 as well as modern historical instances of major wars (Korea, Vietnam, Gulf War, Operation Iraqi Freedom), to see whether there was any consistent trend in U.S. force allocation. The results of our review are presented in Table 5. To this we added 20 percent, both to account for forces and platforms that are likely to be unavailable and to provide a strategic reserve to guard against unforeseen demands.

Summarizing the totals, this Index concluded that a Joint Force capable of dealing with two MRCs simultaneously or nearly simultaneously would consist of:

  • Army: 50 BCTs.
  • Navy: at least 400 ships and 624 strike aircraft.
  • Air Force: 1,200 fighter/attack aircraft.
  • Marine Corps: 30 battalions.

America’s security interests require that the services have the capacity to handle two major regional conflicts successfully.

Readiness. The consequences of the sharp reductions in funding mandated by sequestration over the past decade have caused military service officials, senior DOD officials, and even Members of Congress to warn of the dangers of re-creating the “hollow force” of the 1970s when units existed on paper but were staffed at reduced levels, minimally trained, and woefully ill-equipped.30 To avoid this, the services have traded quantity/capacity and modernization to ensure that what they do have is “ready” for employment.

Supplemental funding in FY 2017, a higher topline in FY 2018, and sustained increases in funding in FY 2019 and through FY 2020 have helped to stop the bleeding and have enabled the services to plan and implement readiness recovery efforts. Massive federal spending in response to the COVID-19 pandemic in calendar year 2020 led to fiscal pressure on defense accounts in future years, but gains in readiness were preserved during FY 2020. Ensuring adequate readiness in FY 2021 has been difficult given the challenges created by COVID-19 during the preceding year.

It is one thing to have the right capabilities to defeat the enemy in battle. It is another thing to have enough of those capabilities to sustain operations and many battles against an enemy over time, especially when attrition or dispersed operations are significant factors. But sufficient numbers of the right capabilities are rather meaningless if the force is not ready to engage in the task.

Scoring. In our final assessments, we tried very hard not to convey a higher level of precision than we think is achievable using unclassified, open-source, publicly available documents; not to reach conclusions that could be viewed as based solely on assertions or opinion; and not to rely solely on data and information that can be highly quantified. Simple numbers, while important, do not tell the whole story.

We believe that the logic underlying our methodology is sound. This Index drew from a wealth of public testimony from senior government officials, from the work of recognized experts in the defense and national security analytic community, and from historical instances of conflict that seemed most appropriate to this project. It then considered several questions, including:

  • How does one place a value on the combat effectiveness of such concepts as Air-Sea Battle, Multi-Domain Operations, Littoral Operations in a Contested Environment, Distributed Maritime Operations, Network-centric Operations, or Joint Operational Access?
  • Is it entirely possible to assess accurately (1) how well a small number of newest-generation ships or aircraft will fare against a much larger number of currently modern counterparts when (2) U.S. forces are operating thousands of miles from home, (3) orchestrated with a particular operational concept, and (4) the enemy is leveraging a “home field advantage” that includes strategic depth and much shorter and perhaps better protected lines of communication and (5) might be pursuing much dearer national objectives than the U.S. is pursuing so that the political will to conduct sustained operations in the face of mounting losses might differ dramatically?
  • How does one neatly quantify the element of combat experience, the erosion of experience as combat operation events recede in time and those who participated in them leave the force, the health of a supporting workforce, the value of “presence and engagement operations,” and the related force structures and patterns of deployment and employment that presumably deter war or mitigate its effects if it does occur?

New capabilities such as unmanned systems, cyber tools, hypervelocity platforms and weapons, and the use of artificial intelligence to achieve a better understanding of operations and orchestrate them more effectively have the potential to change military force posture calculations in the future. At the present time, however, they are not realized in any practical sense.

This Index focused on the primary purpose of military power—to defeat an enemy in combat—and the historical record of major U.S. engagements for evidence of what the U.S. defense establishment has thought was necessary to execute a major conventional war successfully. To this we added the two-MRC benchmark; on-the-record assessments of what the services themselves are saying about their status relative to validated requirements; and the analysis and opinions of various experts, both in and out of government, who have covered these issues for many years.

Taking it all together, we rejected scales that would imply extraordinary precision and settled on a scale that conveys broader characterizations of status that range from very weak to very strong. Ultimately, any such assessment is a judgment call informed by quantifiable data, qualitative assessments, thoughtful deliberation, and experience. We trust that our approach makes sense, is defensible, and is repeatable.

Endnotes

  1. Les Aspin, Secretary of Defense, Report on the Bottom-Up Review, U.S. Department of Defense, October 1993, p. iii, https://www.hsdl.org/?view&did=448259 (accessed July 8, 2021).
  2. Ibid., p. 8.
  3. Commission on the National Defense Strategy, Providing for the Common Defense: The Assessment and Recommendations of the National Defense Strategy Commission, https://www.usip.org/sites/default/files/2018-11/providing-for-the-common-defense.pdf (accessed July 8, 2021), and press release, “National Defense Strategy Commission Releases Its Review of 2018 National Defense Strategy,” United States Institute of Peace, November 13, 2018, https://www.usip.org/press/2018/11/national-defense-strategy-commission-releases-its-review-2018-national-defense (accessed July 8, 2021).
  4. President Joseph R. Biden, Jr., Interim National Security Strategic Guidance, The White House, March 2021, p. 9, https://www.whitehouse.gov/wp-content/uploads/2021/03/NSC-1v2.pdf (accessed July 8, 2021).
  5. The United States has not had to contend in combat with any credible air force since the Vietnam War, but U.S. Air Force planners are increasingly concerned about an enemy’s ground-based, anti-air missile capability. Naval planners are much more concerned about ship-based, air-based, and shore-based anti-ship cruise missiles than they are about the number of conventional surface combatants armed with large-caliber guns that an enemy navy has. Likewise, ground force planners have to consider the numbers and types of guided anti-armor weapons that an enemy possesses and whether an opposing force has guided artillery, mortar, or rocket capabilities. Guided/precision weapons are typically less expensive (by orders of magnitude) than the platforms they target, which means that countries can produce far more guided munitions than primary weapons platforms. Adding this to the rise of unmanned platforms capable of carrying anti-platform weapons makes the threat environment even more complicated. Some examples: Harpoon ASCM ($2 million)/DDG-51 Arleigh Burke–Class destroyer ($2 billion); AT4 anti-armor weapon ($1,500)/M1A1 Abrams main battle tank ($9 million); 120mm guided mortar round ($10,000) or 155mm guided artillery round ($100,000)/M198 155mm howitzer ($500,000); S-300 anti-air missile ($1 million)/F/A-18 Hornet ($70 million) or F-35A Lightning II ($78 million).
  6. The use of low-cost drones to attack tanks and other armored vehicles during the 2020 war between Armenia and Azerbaijan proved devastatingly effective. See Benjamin Brimelow, “A Brief, Bloody War in a Corner of Asia Is a Warning About Why the Tank’s Days of Dominance May Be Over,” Business Insider, November 24, 2020, https://www.businessinsider.com/drones-in-armenia-azerbaijan-war-raises-doubt-about-tanks-future-2020-11 (accessed July 8, 2021). In late June 2021, U.S. forces conducted air strikes against Iranian-backed militia groups in Syria that had been using drones to attack U.S. forces in the region—further evidence of the proliferation of these unmanned systems that enable non-state groups to attack state forces with some level of effectiveness. See Eric Schmitt, “U.S. Carries out Air Strikes in Iraq and Syria,” The New York Times, June 27, 2021, https://www.nytimes.com/2021/06/27/us/politics/us-airstrikes-iraq-syria.html (accessed July 8, 2021).
  7. For a detailed discussion of this force, see Richard J. Dunn III, “America’s Reserve and National Guard Components: Key Contributors to U.S. Military Strength,” in 2016 Index of U.S. Military Strength, ed. Dakota L. Wood (Washington: The Heritage Foundation, 2015), pp. 61–73, https://s3.amazonaws.com/ims-2016/PDF/2016_Index_of_US_Military_Strength_FULL.pdf. For the percentage of U.S. military capability that resides in the Guard/Reserve, see ibid., p. 63.
  8. One example of force balancing was the Army’s Aviation Restructuring Initiative, in which the active-duty force sought to redistribute certain rotorcraft platforms among units of the active-duty Army and the National Guard. The Guard has contended that this plan would reduce the capabilities it has gained during recent combat engagements, such as its pilots’ proficiency in flying Apache helicopters. For more on this issue, see U.S. Government Accountability Office, Force Structure: Army’s Analyses of Aviation Alternatives, GAO–15–430R, April 27, 2015, http://www.gao.gov/assets/670/669857.pdf (accessed July 8, 2021), and Enclosure 1, “Force Structure: Army’s Analysis of Aviation Alternatives, Briefing for Congressional Defense Committees,” updated April 27, 2015, in ibid., pp. 8–44.
  9. Thomas W. Spoehr, “U.S. Army,” in 2021 Index of U.S. Military Strength, ed. Dakota L. Wood (Washington: The Heritage Foundation, 2021), pp. 362 and 368, https://www.heritage.org/sites/default/files/2020-11/2021_IndexOfUSMilitaryStrength_ASSESSMENT_POWER_ARMY.pdf.
  10. National Security Strategy of the United States of America, The White House, December 2017, p. 21, https://www.whitehouse.gov/wp-content/uploads/2017/12/NSS-Final-12-18-2017-0905.pdf (accessed July 9, 2021).
  11. Biden, “Interim National Security Strategic Guidance.”
  12. Figure 1.1, “Department of Defense Budget,” in U.S. Department of Defense, Office of the Under Secretary of Defense (Comptroller)/Chief Financial Officer, United States Department of Defense Fiscal Year 2022 Budget Request: Defense Budget Overview, May 2021, p. 1-5, https://comptroller.defense.gov/Portals/45/Documents/defbudget/FY2022/FY2022_Budget_Request_Overview_Book.pdf (accessed July 9, 2021).
  13. S. 365, Budget Control Act of 2011, Public Law 112-25, 112th Cong., August 2, 2011, https://www.congress.gov/112/plaws/publ25/PLAW-112publ25.pdf (accessed July 12, 2021).
  14. Brendan W. McGarry and Emily M. Morgenstern, “Overseas Contingency Operations Funding: Background and Status,” Congressional Research Service Report for Members and Committees of Congress No. R44519, updated September 6, 2019, p. 1, https://fas.org/sgp/crs/natsec/R44519.pdf (accessed July 9, 2021).
  15. John M. Donnelly, “Analysis: Biden Ends Abuse-Prone Overseas Military Budgets,” Roll Call, April 9, 2021, https://www.rollcall.com/2021/04/09/analysis-biden-ends-abuse-prone-overseas-military-budgets/ (accessed July 9, 2021). See also news release, “The Department of Defense Releases the President’s Fiscal Year 2022 Defense Budget,” U.S. Department of Defense, May 28, 2021, https://www.defense.gov/Newsroom/Releases/Release/Article/2638711/the-department-of-defense-releases-the-presidents-fiscal-year-2022-defense-budg/ (accessed July 9, 2021).
  16. Emil Maine and Diem Salmon, “The Future of Overseas Contingency Operations: Due Diligence Required,” Heritage Foundation Issue Brief No. 4294, November 4, 2014, https://www.heritage.org/defense/report/the-future-overseas-contingency-operations-due-diligence-required.
  17. Aaron Mehta, “DoD Needs 3–5 Percent Annual Growth Through 2023, Top Officials Say,” Defense News, June 13, 2017, http://www.defensenews.com/pentagon/2017/06/13/dod-needs-3-5-percent-annual-growth-through-2023-top-officials-say/ (accessed July 9, 2021). Emphasis added. See also James Mattis, U.S. Secretary of Defense, statement on President’s budget request for FY 2018 before the Committee on Armed Services, U.S. House of Representatives, June 12, 2017, https://docs.house.gov/meetings/AS/AS00/20170612/106090/HHRG-115-AS00-Bio-MattisJ-20170612.pdf (accessed July 9, 2021).
  18. Commission on the National Defense Strategy, Providing for the Common Defense: The Assessment and Recommendations of the National Defense Strategy Commission, p. 22.
  19. Paul McLeary, “Flatline: SecDef Esper Says DoD Budgets Must Grow 3–5%,” Breaking Defense, February 6, 2020, https://breakingdefense.com/2020/02/flatline-secdef-esper-says-dod-budgets-must-grow-3-5/ (accessed July 9, 2021).
  20. Table 6-26, “Department of Defense Discretionary Budget Authority (Continued): Total Funding by Military Department,” in U.S. Department of Defense, Office of the Under Secretary of Defense (Comptroller), National Defense Budget Estimates for FY 2021, April 2020, p. 271, https://comptroller.defense.gov/Portals/45/Documents/defbudget/fy2021/FY21_Green_Book.pdf (accessed July 9, 2021).
  21. Table 1, “CBO’s Baseline Budget Projections, by Category,” in Congressional Budget Office, “An Update to the Budget and Economic Outlook: 2021 to 2031,” July 2021, p. 2, https://www.cbo.gov/publication/57339 (accessed July 9, 2021).
  22. Data Lab, “By the End of 2020, the Federal Government Had $26.95 Trillion in Federal Debt,” USASpending.gov, https://datalab.usaspending.gov/americas-finance-guide/debt/ (accessed July 9, 2021).
  23. Since World War II, the U.S. has fought four major wars: the Korean War (1950–1953); the Vietnam War (1965–1973); the Gulf War/Operation Desert Shield/Desert Storm (1990–1991); and the Iraq War/Operation Iraqi Freedom (2003–2011).
  24. U.S. Space Command (USSPACECOM) is also considered a geographic command, but within the context of this discussion, SPACECOM’s interactions with other countries and the extent to which it must deal with units and peoples operating on its terrain is much different from those of terrestrial commands.
  25. In previous editions of the Index, the capacity of the Marine Corps was assessed against a two-war requirement of 36 battalions: a historical average of 15 battalions for a major conflict (twice that for two) and a 20 percent buffer, bringing the total to 36. The Corps has consistently maintained that it is a one-war force and has no intention of growing to the size needed to fight two wars. Its annual budget requests and top-level planning documents reflect this position. Having assessed that the Indo-Pacific region will continue to be of central importance to the U.S., noting that China is a more worrisome “pacing threat” than any other competitor, and that the Joint Force lacks the ability to operate within the range of intensely weaponized, layered defenses featuring large numbers of precision-guided munitions, the Corps is reshaping itself to optimize its capabilities and organizational structures for this challenge. This Index concurs with this effort but assesses that the Corps will still need greater capacity to succeed in war in the very circumstances for which the Marines believe they must prepare. For a detailed examination of the current state of the Corps, see Dakota Wood, “The U.S. Marine Corps: A Service in Transition,” Heritage Foundation Backgrounder No. 3501, June 16, 2020, https://www.heritage.org/sites/default/files/2020-06/BG3501_0.pdf.
  26. Defense references to war have varied over the past few decades from “major combat operation” (MCO) and “major theater war” (MTW) to the current “major regional contingency” (MRC). Arguably, there is a supporting rationale for such shifts as planners attempt to find the best words to describe the scope and scale of significant military efforts, but the terms are basically interchangeable.
  27. Mattis, Summary of the 2018 National Defense Strategy of the United States of America, p. 4.
  28. General David H. Berger, Commandant of the Marine Corps, “Force Design 2030,” March 2020, pp. 7–8, https://www.hqmc.marines.mil/Portals/142/Docs/CMC38%20Force%20Design%202030%20Report%20Phase%20I%20and%20II.pdf?ver=2020-03-26-121328-460 (accessed July 9, 2021).
  29. The Department of Defense, through the Joint Staff and Geographic Combatant Commanders, manages a relatively small set of real-world operational plans (OPLANS) that are focused on specific situations in which the U.S. feels it is most likely to go to war. These plans are reviewed and updated regularly to account for changes in the Joint Force or with the presumed enemy. They are highly detailed and account not only for the amount of force the U.S. expects that it will need to defeat the enemy, but also for which specific units would deploy; how the force would actually flow into the theater (the sequencing of units); what ports and airfields it would use; how much ammunition, fuel, and other supplies it would need at the start; how much transportation or “lift” would be needed to get the force there (by air, sea, trucks, or rail); and the basic plan of attack. The Pentagon also routinely develops, explores, and refines various notional planning scenarios so that it can better understand the implications of different sorts of contingencies, which approaches might be more effective, how much of what type of force might be needed, and the regional issue or issues for which there would have to be an accounting. These types of planning events inform service efforts to develop, equip, train, and field military forces that are up to the task of defending national security interests. All of these efforts and their products are classified national security information and therefore not available to the public.
  30. For more on the potential for a hollow force, see Association of the United States Army, “Preventing a Hollow Force Is Army’s Top Priority,” May 25, 2017, https://www.ausa.org/news/preventing-hollow-force-army%E2%80%99s-top-priority (accessed July 9, 2021, and J. V. Venable, “America’s Air Force Is in Bad Shape,” National Review, June 13, 2017, http://www.nationalreview.com/article/448556/us-air-force-weakened-funding-cuts-shrinking-workforce-aging-fleet-hurt-preparedness (accessed July 9, 2021).