The foreign policy during the Vietnam war can mainly be described as Internationalism with Collective Security towards the end of the conflict. Internationalism is when one nation or group takes it upon themselves to solve a world problem on their own. In this case America was fighting against Communist North Vietnam in order to maintain South Vietnam’s right to choose their own form of government. South Vietnam and America It was not until the Vietcong turned the tides of the war during the Tet Offensive that America began to really question the war in Vietnam. The foreign policy turned towards Collective Security during the time at which America finally began to withdraw their troops. This was a time at which the American government sent out Green Berets which were men who aided in Vietnamization, the training of South Vietnamese soldiers so that they could fight for their own country. Later America made a peace treaty with North Vietnam, but continued to aid South Vietnam like during the evacuation of Saigon, South Vietnam's capitol at the end of the war.