When South Vietnam fell in 1975, most could not escape. In the last days, the US airlifted its remaining personnel and some high ranking Vietnamese officials - but millions were left behind to await their fate. This is the account of one South Vietnamese veteran who remained in Saigon as North Vietnamese forces took the city. Dr Tran Xuan Dung served as a doctor in the South Vietnamese Marines. He would spend three years imprisoned in a "re-education" camp before fleeing with his family in 1978.

Photo: A South Vietnamese soldier helps his wounded friend during fighting with communist forces in Saigon, 28th April 1975 (Bettmann/Getty Images)