The last U.S. combat troops were withdrawn from South Vietnam in 1973.
Their departure followed the Paris Peace Accords, signed on January 27, 1973, which required the withdrawal of U.S. and allied forces within 60 days. The final major withdrawal took place on March 29, 1973, when the last American combat personnel left South Vietnam and the U.S. Military Assistance Command, Vietnam, was disbanded.
The wording can cause confusion because the last U.S. infantry battalions had already departed in 1972, and American combat activity was suspended in January 1973. However, support, administrative, security, and prisoner-repatriation personnel remained until the final March withdrawal.
The withdrawal did not end the Vietnam War. North Vietnamese and South Vietnamese forces continued fighting after the ceasefire, while U.S. military personnel were largely gone. In April 1975, North Vietnamese forces captured Saigon, ending the existence of South Vietnam and bringing the conflict to its final stage.