1972 in the Vietnam War 1972 in the Vietnam War 1972 in the Vietnam War saw foreign involvement in South Vietnam slowly declining. Two allies, New Zealand and Thailand, which had contributed a small military contingent, left South Vietnam this year. The United States continued to participate in combat, primarily with air power to assist the South Vietnamese army, while negotiators in Paris tried to hammer out a peace agreement and withdrawal strategy for the United States. One American operation that was declassified years after the war was Operation Thunderhead, a secret mission that attempted to rescue POWs. U.S. military personnel in South Vietnam numbered
1955 in the Vietnam War former colonial ties to France. The United States closed its embassy in Hanoi, thus ending formal diplomatic relations with North Vietnam. The U.S. would not restore diplomatic relations until 1998. China informed North Vietnam that all members of the China Military Advisory Group, which had been in Vietnam since July 1950, would return to China. This action by China illustrated the Chinese view that the most important task of North Vietnam was to consolidate its rule rather than attempt to force reunification with South Vietnam. 1955 in the Vietnam War In 1955, the Prime Minister of South Vietnam Ngô Đình