Military branches: Department of the Army, Department of the Navy (includes Marine Corps), Department of the Air Force
note: the Coast Guard is normally subordinate to the Department of Transportation, but in wartime reports to the Department of the Navy

Military manpower - military age: 18 years of age

Military manpower - availability:
males age 15-49: 70,502,691 (2000 est.)

Military manpower - fit for military service:
males age 15-49: 2,056,762 (2000 est.)

Military expenditures - dollar figure: $276.7 billion (FY1999 est.)

Military expenditures - percent of GDP: 3.2% (FY1999 est.)