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| | 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 | 70,819,436 (2001 est.) |
| | | Military manpower - fit for military service |
NA |
| | | Military manpower - reaching military age annually |
| | males | 2,039,414 (2001 est.) |
| | | Military expenditures - dollar figure |
$276.7 billion (FY99 est.) |
| | | Military expenditures - percent of GDP |
3.2% (FY99 est.) |
