Platoon Leader, 2nd Battalion Combat Team (BCT), Counter-Insurgency against the Communist Hukbalahap, 1951
Infantry Company Commander, 16th BCT, Counter-Insurgency against the Communist Hukbalahap, 1951
Platoon Leader, 20th BCT, Philippine Expeditionary Forces to Korea, United Nations Command (PEFTOK-UNC), Chiến tranh Triều Tiên, 1951–1952
Duty, Personnel Research Group, General Headquarters, Armed Forces of the Philippines, 1952–1954
Senior Aide de Camp to Chief of Staff, Armed Forces of the Philippines, 1958–1960
Associate Infantry Company Officer at Fort Bragg, North Carolina, 1960
Founder and Commanding Officer of the elite Special Forces of the Armed Forces of the Philippines, 1962–1965
Chief of Staff of the Philippine Military Contingent-Philippine Civil Action Group to Vietnam (AFP-PHILCAG), Vietnam War, 1965–1968
Presidential Assistant on Military Affairs, 1968–1969
Commander, 3rd Infantry Brigade Philippine Army, 1970
Chief of the Philippine Constabulary, 1970–1986
Command and General Staff of the Philippine Army, 1985
Acting Chief of Staff of the Armed Forces of the Philippines, 1984–1985
Vice Chief of Staff of the Armed Forces of the Philippines, 1985–1986
Military Reformist leader during the People Power Revolution, 1986
Chief of Staff of the Armed Forces of the Philippines, 1986–1988
Secretary of National Defense, 1988–1991
Commander in Chief of the Armed Forces of the Philippines, 1992–1998
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