a Vietnam helicopter pilots war footage of rattlers and firebirds 71st AHC welcome home to all Vietnam vets thanks all gave some some gave all The United States entered the war to prevent a communist takeover of South Vietnam as part of their wider strategy of containment. Military advisors arrived beginning in 1950. U.S. involvement escalated in the early 1960s and combat units were deployed beginning in 1965. Involvement peaked in 1968 at the time of the Tet Offensive. Despite Paris Peace Accords, a peace treaty signed by all parties in January 1973 and Case-Church Amendment, a legislation passed by the U.S. Congress in June 1973 prohibiting further direct U.S. military intervention without Congressional authorization, the U.S. was still heavily invested in the war until 1975. The capture of Saigon by North Vietnamese army, in April 1975, marked the end of Vietnam War. North and South Vietnam were reunified the following year. Air Cav Huey Pilot in Vietnam platoon we were soldiers Casualties and losses Exit of the French, 19501954 South Vietnam . Kingdom of Laos . US . South Korea . Australia . New Zealand . Thailand North Vietnam & NLF . P.R. China . Soviet Union The Vietnam War was a military conflict that occurred in Vietnam, Laos, and Cambodia from 1959 to 30 April 1975. The war was fought between the communist North Vietnam, supported by its communist allies, and the government of South Vietnam, supported by the United States and other member nations of the Southeast Asia Treaty Organization (SEATO).