Military branches:
Ground Self-Defense Force (Army), Maritime Self-Defense Force (Navy), Air Self-Defense Force (Air Force)

Military service age and obligation:
18 years of age for voluntary military service (2001)

Manpower available for military service:
males age 18-49: 27,003,112 (2005 est.)

Manpower fit for military service:
males age 18-49: 22,234,663 (2005 est.)

Manpower reaching military service age annually:
males: 683,147 (2005 est.)

Military expenditures - dollar figure:
$45.841 billion (2004)

Military expenditures - percent of GDP:
1% (2004)