"He was in Vietnam for the battle of Ap Bac and stayed in Saigon until his first collapse back in March. "
Two helicopters downed during the battle
Public DomainA helicopter downed during the battle  Credit: US Army Transportation Museum

The Vietnam War (1959-1975) was a conflict between communist North Vietnam and the South Vietnamese government (plus allies like the U.S.). Seeking to curb the spread of communism, U.S. involvement increased dramatically as the war progressed. They deployed mostly air strike tactics against North Vietnam's guerrila style warfare. The small-scale Battle of Ap Bac (1963), which occurred sixty-four kilometres southwest of Saigon, resulted in the first large combat victory for the communist Viet Cong.  They lost only eighteen men as opposed to the eighty on the opposing side, including three U.S. advisors. They also destroyed nine helicopters and three armoured vehicles.