Military branches:
Army, Navy (includes naval air arm), Air Force, Coast Guard (2011)
Military service age and obligation:
16-18 years of age for voluntary military service (Army 17 1/2, Air Force 17, Navy 16 1/2); no conscription; women may join as officers, currently serve in combat roles as pilots, and will soon be allowed in all combat roles (2016)
Military expenditures:
2.4% of GDP (2014)
2.4% of GDP (2013)
2.5% of GDP (2012)
2.6% of GDP (2011)
2.7% of GDP (2010)
country comparison to the world: 31
[see also: Military expenditures country ranks ]