Military branches:
Army, Navy (includes naval air arm), Air Force, Coast Guard (2011)
Military service age and obligation:
17 years 6 months of age for voluntary military service; no conscription; women may join as officers, but for noncombat roles only (2010)
Manpower available for military service:
males age 16-49: 319,129,420
[see also: Manpower available for military service - male country ranks ]
females age 16-49: 296,071,637 (2010 est.)
[see also: Manpower available for military service - female country ranks ]
Manpower fit for military service:
males age 16-49: 249,531,562
[see also: Manpower fit for military service - male country ranks ]
females age 16-49: 240,039,958 (2010 est.)
[see also: Manpower fit for military service - female country ranks ]
Manpower reaching militarily significant age annually:
male: 12,151,065
[see also: Manpower reaching militarily significant age annually - male country ranks ]
female: 10,745,891 (2010 est.)
[see also: Manpower reaching militarily significant age annually - female country ranks ]
Military expenditures:
2.5% of GDP (2006)
country comparison to the world: 61
[see also: Military expenditures country ranks ]