U.S. Defense Spending: A Century of Military Investment
From peacetime frugality to global superpower: How American military spending evolved through world wars, cold wars, and the war on terror.
In the councils of government, we must guard against the acquisition of unwarranted influence, whether sought or unsought, by the military-industrial complex. The potential for the disastrous rise of misplaced power exists and will persist.President Dwight D. Eisenhower - Farewell Address, January 17, 1961
Three measures of US defense spending appear on this page. The Department of Defense budget ($839.2 billion appropriated for FY2026) covers the Pentagon only. National defense (budget function 050, $965.2 billion in FY2026 outlays) adds the Department of Energy's nuclear weapons work and other defense activities; the historical tables use this measure. SIPRI's military expenditure is broader again and counts calendar years, which is why its US figure for calendar 2025 ($954 billion) is higher than the $916 billion of FY2025 national defense outlays.
01Historical Spending Patterns
For most of American history, the nation maintained minimal peacetime military forces. Defense spending typically hovered around 1% of GDP in peacetime, spiking dramatically during conflicts. This changed permanently after World War II, when the United States assumed the role of global superpower and never fully demobilized.
Defense Spending as Percentage of GDP (1940-2025)
02Major Conflicts & Defense Spending
Each major conflict has reshaped American defense spending, often permanently. Wars have consistently pushed spending to new heights, with some leading to lasting structural increases in the military establishment.
| 1941- 1945 |
World War II$4.1T Military Cost (CRS, FY2011 dollars) · 37.0% Peak Defense % of GDP (1944) The most expensive war in U.S. history. Defense consumed nearly 90% of federal outlays at its peak (89.5% in 1945). American industry converted entirely to war production - Ford made bombers, Chrysler made tanks. |
| 1950- 1953 |
Korean War$341B Military Cost (CRS, FY2011 dollars) · 13.8% Peak Defense % of GDP (1953) Triggered a massive permanent military buildup. Defense spending nearly tripled from 4.9% of GDP (1950) to 13.8% (1953) and never returned to pre-war levels - establishing the Cold War military posture. |
| 1947- 1991 |
Cold War~7% Average % of GDP · 44 yrs Duration Sustained elevated spending for four decades. Nuclear arms race, massive conventional forces in Europe, space race, and proxy conflicts around the globe. Defense stayed above 5% of GDP for most of the period, but dipped to 3.5% in 1948 and 4.5% in 1979. |
| 1965- 1975 |
Vietnam War$738B Military Cost (CRS, FY2011 dollars) · 9.1% Peak Defense % of GDP (1968) Defense peaked at 9.1% of GDP in 1968, the last year it exceeded 9%. The war's unpopularity led to post-war cuts - spending fell to 4.5% by 1979, the lowest since 1948. |
| 1981- 1989 |
Reagan Buildup6.0% Peak % of GDP (1986) · +41% Real Spending Increase, 1981-1986 "Peace through strength." Massive expansion including Strategic Defense Initiative ("Star Wars"), 600-ship Navy goal, and modernization of nuclear forces to counter Soviet Union. |
| 1990- 1991 |
Gulf War$102B Military Cost (CRS, FY2011 dollars) · $54B Allied Contributions Short, decisive, and relatively inexpensive. Coalition allies (Saudi Arabia, Kuwait, Japan, Germany) covered most costs. Showcased post-Cold War American military dominance. |
| 2001- 2021+ |
War on Terror (Afghanistan & Iraq)$8T+ Total Estimated Cost (Including Future Veterans Care and Interest, Brown) · $2.3T Afghanistan/Pakistan · $2.1T Iraq/Syria · 4.7% Peak % of GDP (2010) The $8 trillion total is not comparable with the $4.1 trillion World War II figure above. Brown's estimate is a broad, lifetime budget cost that adds future veterans care, interest on war borrowing and war-related homeland security spending, while the CRS figures for earlier wars count military operations only. CRS's comparable direct-cost figure for the post-9/11 wars covered only FY2001-FY2010 ($1,147 billion in FY2011 dollars), and on that direct basis World War II remains the most expensive U.S. war. National defense outlays increased from $294 billion (2000) to $705 billion (2011). The rest of the $8 trillion total is mainly $2.2 trillion in future veterans care already committed, about $355 billion for other war zones, and war-related homeland security spending and interest on war borrowing (Brown University Costs of War, September 2021). Brown University's Costs of War Project estimates more than 940,000 direct deaths from post-9/11 war violence across all conflict zones, 2001-2023. |
03Comparative Cost of Major U.S. Wars
Direct Military Costs of Major U.S. Wars (Constant FY2011 Dollars, CRS)
Note: These figures represent direct military costs only, from the Congressional Research Service (Costs of Major U.S. Wars, RS22926, June 2010) in constant fiscal 2011 dollars; the Civil War bar combines Union and Confederate costs. They exclude veterans benefits, interest on war debt, and long-term economic impacts. *The post-9/11 bar is CRS's figure for FY2001-FY2010 only ($1,147 billion); war spending continued after 2010, so the full direct cost is higher. CRS cautions that figures across such different periods are snapshots rather than truly comparable numbers. The true cost of recent conflicts is significantly higher when veterans care and interest are included.
04Defense Spending Over Time
| Year | Nominal ($B) | Real 2025 ($B) | % of GDP | % of Federal Budget | Context |
|---|---|---|---|---|---|
| 1940 | $1.7 | $38 | 1.7% | 18% | Pre-WWII |
| 1945 | $83 | $1,492 | 36.6% | 90% | WWII Peak |
| 1948 | $9.1 | $125 | 3.5% | 31% | Post-WWII Low |
| 1953 | $53 | $634 | 13.8% | 69% | Korean War Peak |
| 1960 | $48 | $524 | 9.0% | 52% | Cold War |
| 1968 | $82 | $771 | 9.1% | 46% | Vietnam Peak |
| 1979 | $116 | $529 | 4.5% | 23% | Post-Vietnam Low |
| 1986 | $273 | $801 | 6.0% | 28% | Reagan Buildup |
| 2000 | $294 | $552 | 2.9% | 17% | Peace Dividend |
| 2010 | $693 | $1,021 | 4.7% | 20% | War on Terror Peak (real terms) |
| 2015 | $590 | $797 | 3.2% | 16% | Post-Iraq Drawdown |
| 2020 | $725 | $899 | 3.4% | 11% | COVID Year |
| 2024 | $874 | $897 | 3.0% | 13% | Great power competition |
| 2025 | $916 | $916 | 3.0% | 13% | First year above $900 billion |
05100 Years of U.S. Defense Spending (1925-2025)
A comprehensive year-by-year look at American military expenditure over the past century, showing how defense spending has responded to wars, economic conditions, and shifting national priorities.
| Year | Nominal ($B) | 2025 Dollars ($B) | % of GDP | Notes |
|---|---|---|---|---|
| 1925 | $0.6 | $11 | 0.7% | Peacetime |
| 1926 | $0.6 | $11 | 0.6% | Peacetime |
| 1927 | $0.6 | $11 | 0.6% | Peacetime |
| 1928 | $0.7 | $13 | 0.7% | Peacetime |
| 1929 | $0.7 | $13 | 0.7% | Pre-Depression |
| 1930 | $0.7 | $13 | 0.8% | Depression begins |
| 1931 | $0.7 | $14 | 0.9% | Depression |
| 1932 | $0.7 | $16 | 1.2% | Depression |
| 1933 | $0.6 | $15 | 1.1% | Depression low |
| 1934 | $0.5 | $12 | 0.8% | New Deal era |
| 1935 | $0.7 | $16 | 1.0% | New Deal era |
| 1936 | $0.9 | $21 | 1.1% | Europe tensions rise |
| 1937 | $1.0 | $23 | 1.1% | Japan invades China |
| 1938 | $1.0 | $22 | 1.2% | Munich Agreement |
| 1939 | $1.3 | $30 | 1.4% | WWII begins in Europe |
| 1940 | $1.7 | $38 | 1.7% | Rearmament begins |
| 1941 | $6.4 | $145 | 5.5% | Pearl Harbor (Dec) |
| 1942 | $25.7 | $527 | 17.4% | Full mobilization |
| 1943 | $66.7 | $1,260 | 36.1% | WWII peak buildup |
| 1944 | $79.1 | $1,453 | 37.0% | D-Day, Pacific advance |
| 1945 | $83.0 | $1,492 | 36.6% | WWII peak spending |
| 1946 | $42.7 | $749 | 18.7% | Rapid demobilization |
| 1947 | $12.8 | $193 | 5.4% | Truman Doctrine |
| 1948 | $9.1 | $125 | 3.5% | Post-war low |
| 1949 | $13.2 | $175 | 4.8% | NATO founded |
| 1950 | $13.7 | $185 | 4.9% | Korean War begins |
| 1951 | $23.6 | $300 | 7.2% | Korea escalation |
| 1952 | $46.1 | $561 | 12.9% | Korea peak |
| 1953 | $52.8 | $634 | 13.8% | Korea armistice |
| 1954 | $49.3 | $586 | 12.7% | Post-Korea |
| 1955 | $42.7 | $511 | 10.5% | Cold War plateau |
| 1956 | $42.5 | $506 | 9.7% | Suez Crisis |
| 1957 | $45.4 | $526 | 9.8% | Sputnik launched |
| 1958 | $46.8 | $525 | 9.9% | Space race begins |
| 1959 | $49.0 | $542 | 9.7% | Cold War |
| 1960 | $48.1 | $524 | 9.0% | U-2 incident |
| 1961 | $49.6 | $534 | 9.1% | Bay of Pigs, Berlin Wall |
| 1962 | $52.3 | $557 | 8.9% | Cuban Missile Crisis |
| 1963 | $53.4 | $562 | 8.6% | Vietnam advisors |
| 1964 | $54.8 | $568 | 8.3% | Gulf of Tonkin |
| 1965 | $50.6 | $519 | 7.1% | Vietnam escalation |
| 1966 | $58.1 | $583 | 7.4% | Vietnam buildup |
| 1967 | $71.4 | $694 | 8.5% | Vietnam surge |
| 1968 | $81.9 | $771 | 9.1% | Vietnam peak, Tet |
| 1969 | $82.5 | $740 | 8.4% | Nixon takes office |
| 1970 | $81.7 | $692 | 7.8% | Vietnamization |
| 1971 | $78.9 | $635 | 7.1% | Drawdown continues |
| 1972 | $79.2 | $616 | 6.5% | SALT I signed |
| 1973 | $76.7 | $573 | 5.7% | Paris Peace Accords |
| 1974 | $79.3 | $545 | 5.4% | Nixon resigns |
| 1975 | $86.5 | $534 | 5.4% | Saigon falls |
| 1976 | $89.6 | $517 | 5.0% | Post-Vietnam |
| 1977 | $97.2 | $522 | 4.8% | Carter takes office |
| 1978 | $104.5 | $524 | 4.6% | Camp David Accords |
| 1979 | $116.3 | $529 | 4.5% | Iran hostage crisis |
| 1980 | $134.0 | $536 | 4.8% | Soviet-Afghan War |
| 1981 | $157.5 | $567 | 5.0% | Reagan takes office |
| 1982 | $185.3 | $621 | 5.6% | Reagan buildup |
| 1983 | $209.9 | $680 | 5.9% | SDI announced |
| 1984 | $227.4 | $708 | 5.8% | 600-ship Navy goal |
| 1985 | $252.7 | $758 | 5.9% | Reagan peak |
| 1986 | $273.4 | $801 | 6.0% | Reagan peak |
| 1987 | $282.0 | $803 | 5.9% | INF Treaty |
| 1988 | $290.4 | $794 | 5.7% | Cold War thaw |
| 1989 | $303.6 | $792 | 5.5% | Berlin Wall falls |
| 1990 | $299.3 | $744 | 5.1% | Iraq invades Kuwait |
| 1991 | $273.3 | $647 | 4.5% | Gulf War, USSR dissolves |
| 1992 | $298.3 | $686 | 4.6% | Peace dividend begins |
| 1993 | $291.1 | $649 | 4.3% | Clinton takes office |
| 1994 | $281.6 | $612 | 3.9% | Drawdown continues |
| 1995 | $272.1 | $575 | 3.6% | Bosnia deployment |
| 1996 | $265.7 | $546 | 3.3% | Post-Cold War low |
| 1997 | $270.5 | $542 | 3.2% | NATO expansion |
| 1998 | $268.2 | $529 | 3.0% | Embassy bombings |
| 1999 | $274.8 | $531 | 2.9% | Kosovo War |
| 2000 | $294.4 | $552 | 2.9% | Post-Cold War floor |
| 2001 | $304.7 | $553 | 2.9% | 9/11 attacks |
| 2002 | $348.5 | $623 | 3.2% | Afghanistan War |
| 2003 | $404.7 | $707 | 3.6% | Iraq War begins |
| 2004 | $455.8 | $779 | 3.8% | Iraq insurgency |
| 2005 | $495.3 | $819 | 3.9% | Iraq surge planning |
| 2006 | $521.8 | $832 | 3.8% | Iraq violence peaks |
| 2007 | $551.3 | $859 | 3.9% | Iraq surge |
| 2008 | $616.1 | $919 | 4.2% | Financial crisis |
| 2009 | $661.0 | $989 | 4.6% | Afghanistan surge |
| 2010 | $693.5 | $1,021 | 4.7% | War on Terror peak |
| 2011 | $705.6 | $1,012 | 4.6% | Bin Laden killed |
| 2012 | $677.9 | $949 | 4.2% | Iraq withdrawal |
| 2013 | $633.4 | $873 | 3.8% | Sequestration begins |
| 2014 | $603.5 | $818 | 3.5% | ISIS rises |
| 2015 | $589.7 | $797 | 3.2% | Anti-ISIS campaign |
| 2016 | $593.4 | $795 | 3.2% | Russia tensions |
| 2017 | $598.7 | $786 | 3.1% | Trump takes office |
| 2018 | $631.3 | $809 | 3.1% | Budget caps lifted |
| 2019 | $685.7 | $863 | 3.2% | Great power focus |
| 2020 | $724.6 | $899 | 3.4% | COVID pandemic |
| 2021 | $753.9 | $905 | 3.3% | Afghanistan withdrawal |
| 2022 | $765.6 | $852 | 3.0% | Ukraine war begins |
| 2023 | $820.3 | $868 | 3.0% | Ukraine aid |
| 2024 | $873.5 | $897 | 3.0% | Great power competition |
| 2025 | $916.1 | $916 | 3.0% | First year above $900 billion |
Methodology: From 1940 the tables show national defense outlays (budget function 050) for each fiscal year from the OMB Historical Tables, Table 3.1 (FY2027 Budget), with the shares of GDP and of total federal outlays from the same table. Figures before 1940 predate the OMB series and are not on exactly the same basis. Inflation-adjusted figures are in fiscal 2025 dollars, using the consumer price index (CPI-U) averaged over each fiscal year. OMB revises past shares of GDP when GDP is revised.
Update, October 19, 2026: On a cash (outlay) basis, national defense spending (budget function 050) was $916.6 billion in fiscal year 2025 and $965.2 billion in fiscal year 2026, about 13% of total federal outlays in both years (Treasury Monthly Treasury Statement, September 2026). Treasury's figure for fiscal 2025 differs slightly from OMB's $916.1 billion in the table. For FY2026, Congress provided $839.2 billion for the Department of Defense in the Consolidated Appropriations Act, 2026, signed February 3, 2026 (CRS R48891). As of October 2026 the FY2027 NDAA had passed the House but not the Senate, and defense was funded by a continuing resolution running to December 11, 2026.
06Global Military Spending Comparison
The United States spends more on defense than the next six countries combined. In 2025, U.S. military spending was $954 billion, down 7.5% from 2024 but still 33% of the $2,887 billion world total and about 2.8 times China's estimated $336 billion (SIPRI, Trends in World Military Expenditure, 2025, published April 27, 2026). SIPRI counts calendar-year spending in current U.S. dollars on a broader definition than the Pentagon budget, so its U.S. figure is higher than the $916.1 billion in FY2025 national defense outlays shown in the tables on this page.
Top 10 Military Spenders, 2025 (SIPRI 2025)
Source: SIPRI Military Expenditure Database, fact sheet April 2026. Billions of current U.S. dollars, 2025. China, Russia, Ukraine and Saudi Arabia are SIPRI estimates.
07Notable Quotes on Defense Spending
We know only too well that war comes not when the forces of freedom are strong, but when they are weak. It is then that tyrants are tempted.President Ronald Reagan - Republican National Convention, 1980
Every gun that is made, every warship launched, every rocket fired signifies, in the final sense, a theft from those who hunger and are not fed, those who are cold and are not clothed.President Dwight D. Eisenhower - "Chance for Peace" Speech, 1953
The jet plane that roars overhead costs three quarters of a million dollars. That's more than a man will make in his lifetime. What world can afford this kind of thing for long?President Dwight D. Eisenhower - On military costs
To be prepared for war is one of the most effective means of preserving peace.President George Washington - First Annual Address to Congress, 1790
A nation that continues year after year to spend more money on military defense than on programs of social uplift is approaching spiritual doom.Dr. Martin Luther King Jr. - "Beyond Vietnam" Speech, 1967
08Where the Money Goes
The FY2024 defense budget of $886 billion is allocated across several major categories:
Defense Budget Breakdown by Category
09Key Milestones in Defense Spending
| 1792 | Congress first officially allocates money for defense budget |
| 1900 | Defense spending averages ~1% of GDP; U.S. has minimal standing army |
| 1918 | WWI peak: Defense reaches 22% of GDP |
| 1945 | WWII peak: Defense hits 37.0% of GDP (1944) and nearly 90% of federal outlays (1945) |
| 1947 | National Security Act creates unified Department of Defense, CIA, NSC |
| 1949 | NATO established; U.S. commits to collective defense |
| 1953 | Korean War peak: 13.8% of GDP; permanent Cold War military established |
| 1961 | Eisenhower warns of "military-industrial complex" in farewell address |
| 1968 | Vietnam peak: Last year defense exceeds 9% of GDP |
| 1979 | Post-Vietnam low: Defense falls to 4.5% of GDP |
| 1983 | Reagan announces Strategic Defense Initiative ("Star Wars") |
| 1991 | Soviet Union collapses; "peace dividend" begins |
| 2000 | Post-Cold War low: Defense at 2.9% of GDP |
| 2001 | 9/11 attacks; War on Terror begins; spending trajectory reverses |
| 2010 | War on Terror peak: $693.5B nominal, highest since WWII in real terms (the War on Terror nominal high was $705.6B in 2011) |
| 2011 | Budget Control Act imposes sequestration caps |
| 2021 | U.S. withdraws from Afghanistan after 20 years |
| 2024 | Defense budget reaches $886B amid renewed great power competition |
| 2025 | One Big Beautiful Bill Act (July 4, 2025) adds $156.2B in multi-year defense funding; FY2026 NDAA signed December 18, 2025 authorizes $890.6B for national defense |
| 2026 | FY2026 Defense appropriations of $839.2B enacted February 3, 2026; national defense outlays reach $965B for FY2026 (Treasury MTS). A June 2026 request for $87.6B in supplemental funding ($67.1B for the Pentagon) had not been enacted as of October 2026 |
10The Defense Spending Debate
Arguments for Higher Spending
- Deterrence: Strong military prevents wars by discouraging aggression ("peace through strength")
- Great power competition: China and Russia are rapidly modernizing their militaries
- Technological edge: Advanced weapons require massive R&D investment
- Alliance obligations: NATO and other treaty commitments require credible force
- Global stability: U.S. military presence underwrites international order
- Economic impact: Defense industry supports millions of jobs
Arguments for Lower Spending
- Opportunity cost: Every defense dollar is unavailable for education, healthcare, infrastructure
- Already dominant: U.S. spends more than the next six countries combined (SIPRI, calendar 2025)
- Waste and inefficiency: Pentagon has never passed a full audit
- Mission creep: Large military encourages unnecessary interventions
- Debt burden: Defense spending contributes to unsustainable deficits
- Ally free-riding: U.S. spending enables European underspending
11Future Outlook
Key factors that could affect future defense spending include:
- China's military modernization - Pacific deterrence is the Pentagon's top priority
- European security - Russia-Ukraine conflict has increased pressure on NATO spending
- Nuclear modernization - Triad replacement estimated at $756+ billion over 10 years
- Emerging technologies - AI, hypersonics, space, and cyber require new investments
- Personnel costs - All-volunteer force compensation continues to rise
- Fiscal constraints - Growing entitlements and debt interest limit discretionary budgets
12Notes and Sources
Note: Defense spending figures can vary depending on definitions used. Narrow definitions include only Department of Defense spending. Broader definitions add veterans affairs, nuclear weapons activities (DOE), homeland security, and foreign military aid.
Data Sources: Congressional Budget Office, Office of Management and Budget, Stockholm International Peace Research Institute (SIPRI), Congressional Research Service, Brown University Costs of War Project, U.S. Bureau of Economic Analysis, Department of Defense Comptroller.
Corrections and Updates
| Date | What changed |
|---|---|
| October 31, 2026 | Moved the world comparison from SIPRI's 2024 data to its 2025 data (published April 27, 2026): the US spent $954 billion, more than the next six countries combined (previously the next nine), and 33% of the world total. |
| October 25, 2026 | Removed claim that post-9/11 wars were second most expensive after WWII (different cost scopes); war-cost chart put on a consistent CRS FY2011-dollar basis (Korea $341B, Vietnam $738B, post-9/11 FY2001-10 $1,147B); Brown $8T noted to include interest; Brown deaths updated to more than 940,000 (2001-2023). |
| October 24, 2026 | Rebuilt the spending tables on one basis: national defense outlays from the OMB Historical Tables (Table 3.1, FY2027 Budget), with inflation-adjusted figures in fiscal 2025 dollars. Fiscal 2022 and 2024 had shown budget authority rather than outlays, and fiscal 2025 showed a budgeted figure; these are now actual outlays ($765.6 billion, $873.5 billion and $916.1 billion). |
| October 24, 2026 | Global comparison section now uses SIPRI 2024 data: U.S. $997 billion, China $314 billion, Russia $149 billion, with Ukraine entering the top 10. |
| October 24, 2026 | Corrected the WWII share of federal outlays to 89.5% (1945), FY2010 defense outlays to $693.5 billion and the 1979 share to 23%, and made the summary table match the 100-year table. |
| October 24, 2026 | Corrected peak %-of-GDP figures for WWII, Korea, Vietnam, Reagan and the War on Terror to match the OMB year table, fixed the Cold War average and floor, and itemized the $8T post-9/11 cost. |
Every correction to a published figure on this site is logged on Sources and Methods.
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