Military branches:

Secretariat of National Defense (Secretaria de Defensa Nacional, Sedena): Army (Ejercito, includes Mexican Air Force (Fuerza Aerea Mexicana, FAM)); Secretariat of the Navy (Secretaria de Marina, Semar): Mexican Navy (Armada de Mexico, ARM, includes Naval Air Force (FAN) and naval infantry) (2008)

Military service age and obligation:

18 years of age for compulsory military service, conscript service obligation - 12 months; 16 years of age with consent for voluntary enlistment; conscripts serve only in the Army; Navy and Air Force service is all voluntary; women are eligible for voluntary military service (2007)

Manpower available for military service:

males age 16-49: 27,774,688
females age 16-49: 29,376,791 (2008 est.)

Manpower fit for military service:

males age 16-49: 22,188,284
females age 16-49: 24,884,614 (2008 est.)

Manpower reaching militarily significant age annually:

males age 16-49: 1,110,544
females age 16-49: 1,073,223 (2008 est.)

Military expenditures - percent of GDP:

0.5% (2006 est.)