| Military branches |
Army, Navy and Marine Corps, Air Force, and Coast Guard (Coast Guard administered in peacetime by the Department of Homeland Security, but in wartime reports to the Department of the Navy) |
| Military manpower - military age |
18 years of age (2004 est.) |
| Military manpower - availability |
males age 15-49: 73,597,731 (2004 est.) |
| Military manpower - fit for military service |
NA (2004 est.) |
| Military manpower - reaching military age annually |
males: 2,124,164 (2004 est.) |
| Military expenditures - dollar figure |
$370.7 billion (FY04 est.) (March 2003) |
| Military expenditures - percent of GDP |
3.3% (FY03 est.) (February 2004) |