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How the Defense Budget Is Split

Share of Defense Department total obligational authority by department, fiscal years, %

Army: 20.2% in 2026the lowest in data back to 1948−6.4 pp since 1948

1 of 4 series is above their level a year earlier·1 of 4 is at a five-year high·1 of 4 is at a five-year low

Plays the chart through its history. Pauses are where the data set a record or moved most.

U.S. Department of Defense, Comptroller, National Defense Budget Estimates (Green Book), Table 6-3: total obligational authority by fiscal year, war and supplemental funding included. The Navy includes the Marine Corps and the Air Force the Space Force. Shares are Palanor’s arithmetic on current dollars.

The services’ shares of the defense budget since 1948: the Air Force’s 1950s dominance, the Army’s wartime surges and the steady growth of defense-wide agencies.

What this chart reads

Sources

Share of the DoD Budget (TOA) · Army · %. Source: Palanor calculation (scripts/v23a/load-static.ts) from U.S. Department of Defense, Office of the Under Secretary of Defense (Comptroller), National Defense Budget Estimates for FY 2027 (the "Green Book"), Table 6-3, TOA by Military Department (current and FY 2027 constant dollars): https://comptroller.war.gov/Budget-Materials/ (fy27_Green_Book.pdf). A work of the U.S. Government (17 U.S.C. §105), public domain. Parsed by scripts/v23a/green-book-toa.mjs into src/lib/defense/green-book-toa.ts; loaded by scripts/v23a/load-static.ts each year when the new Green Book appears.

Share of the DoD Budget (TOA) · Navy (incl. Marine Corps) · %. Source: Palanor calculation (scripts/v23a/load-static.ts) from U.S. Department of Defense, Office of the Under Secretary of Defense (Comptroller), National Defense Budget Estimates for FY 2027 (the "Green Book"), Table 6-3, TOA by Military Department (current and FY 2027 constant dollars): https://comptroller.war.gov/Budget-Materials/ (fy27_Green_Book.pdf). A work of the U.S. Government (17 U.S.C. §105), public domain. Parsed by scripts/v23a/green-book-toa.mjs into src/lib/defense/green-book-toa.ts; loaded by scripts/v23a/load-static.ts each year when the new Green Book appears.

Share of the DoD Budget (TOA) · Air Force (incl. Space Force) · %. Source: Palanor calculation (scripts/v23a/load-static.ts) from U.S. Department of Defense, Office of the Under Secretary of Defense (Comptroller), National Defense Budget Estimates for FY 2027 (the "Green Book"), Table 6-3, TOA by Military Department (current and FY 2027 constant dollars): https://comptroller.war.gov/Budget-Materials/ (fy27_Green_Book.pdf). A work of the U.S. Government (17 U.S.C. §105), public domain. Parsed by scripts/v23a/green-book-toa.mjs into src/lib/defense/green-book-toa.ts; loaded by scripts/v23a/load-static.ts each year when the new Green Book appears.

Share of the DoD Budget (TOA) · Defense-wide · %. Source: Palanor calculation (scripts/v23a/load-static.ts) from U.S. Department of Defense, Office of the Under Secretary of Defense (Comptroller), National Defense Budget Estimates for FY 2027 (the "Green Book"), Table 6-3, TOA by Military Department (current and FY 2027 constant dollars): https://comptroller.war.gov/Budget-Materials/ (fy27_Green_Book.pdf). A work of the U.S. Government (17 U.S.C. §105), public domain. Parsed by scripts/v23a/green-book-toa.mjs into src/lib/defense/green-book-toa.ts; loaded by scripts/v23a/load-static.ts each year when the new Green Book appears.

Charts are drawn from Palanor's signal library and recomputed from source data on every view. Transformations (changes, indexing, year-on-year rates) are Palanor's.

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