Indicator	Value
Military expenditure (% GDP)	3.42 %SIPRI via World Bank WDI [2024]
Military expenditure	997,000,000,000 US$SIPRI via World Bank WDI [2024]
Armed forces personnel	1,400,000 peopleWorld Bank WDI [2020]
Arms imports	1,210,000,000 US$SIPRI via World Bank WDI [2024]
Arms exports	13,500,000,000 US$SIPRI via World Bank WDI [2024]
Military & security forces	United States Armed Forces (aka US Military): US Army (USA), US Navy (USN; includes US Marine Corps or USMC), US Air Force (USAF), US Space Force (USSF); US Coast Guard (USCG); National Guard (Army National Guard and Air National Guard) (2025); note: note 1: the US Coast Guard is administered in peacetime by the Department of Homeland Security, but in wartime reports to the Navynote 2: the Army National Guard and the Air National Guard are reserve components of their services and operate in part under state authority; the US military also maintains reserve forces for each branchnote 3: US law enforcement personnel include those of federal agencies, such as the Department of Homeland Security and Department of Justice, the 50 states, special jurisdictions, local sheriff’s offices, and municipal, county, regional, and tribal police departmentsnote 4: some US states have "state defense forces" (SDFs), which are military units that operate under the sole authority of state governments; SDFs are authorized by state and federal law and are under the command of the governor of each state; most are organized as ground units, but air and naval units also existCIA World Factbook [2025] · 2026 archive
Military service age & obligation	17 years of age (under 18 with parental consent) for voluntary service for men and women; maximum enlistment age varies by service; 8-year initial service obligation, including 2-5 years active duty depending on the particular military service (2025); note: note 1: the US military has been all-volunteer since 1973, but an act of Congress can reinstate the draft in case of a national emergency; males aged 18-25 must register with Selective Servicenote 2: all military occupations and positions open to women; women comprised 17.7% of the total US regular military personnel as of 2023note 3: non-citizens living permanently and legally in the US may join as enlisted personnel; they must have permission to work in the US, a high school diploma, and speak, read, and write English fluently; under the Compact of Free Association, citizens of the Federated States of Micronesia, the Republic of Palau, and the Republic of the Marshall Islands may volunteerCIA World Factbook [2025] · 2026 archive
Arms imports (USD)	1,210,000,000 US$SIPRI via World Bank WDI [2024]
Arms exports (USD)	13,500,000,000 US$SIPRI via World Bank WDI [2024]
Military spending (% of GDP)	3.42 %SIPRI via World Bank WDI [2024]
Military spending (USD)	997,000,000,000 US$SIPRI via World Bank WDI [2024]