"In the spring of 1975, near the time of Saigon's final collapse"
Fall of Saigon

The city of Saigon was captured on April 30, 1975 by the National Liberation Front and the People's Army of Vietnam, bringing an end to the Vietnam war.

Before the attack, a massive evacuation of the city was organized--the largest in the world--referred to as Operation Frequent Wind. On April 29 the North Vietnamese troops used artillery to bombard the city. The last two U.S. troops to die in Vietnam were killed in this attack. By the next day the attacking forces had taken over the city.