Military branches: 

Australian Defense Force (ADF): Australian Army, Royal Australian Navy, Royal Australian Air Force, Special Operations Command

Military service age and obligation: 

16 years of age for voluntary service (2001)

Manpower available for military service: 

males age 16-49: 4,943,676 (2005 est.)

Manpower fit for military service: 

males age 16-49: 4,092,717 (2005 est.)

Manpower reaching military service age annually: 

males: 142,158 (2005 est.)

Military expenditures - dollar figure: 

$16.65 billion (2004)

Military expenditures - percent of GDP: 

2.7% (2004)