The United States Embassy in Saigon was first established in June 1952, and moved into a new building in 1967 and eventually closed in 1975. The embassy was the scene of a number of significant events of the Vietnam War, most notably the Viet Cong attack during the Tet Offensive which helped turn American public opinion against the war, and the helicopter evacuation during the Fall of Saigon after which the embassy closed permanently.

The Viet Cong was an epithet and umbrella term to call the communist-driven armed movement and united front organization in South Vietnam, Laos and Cambodia. Formally organized as and led by the National Liberation Front of South Vietnam, it fought under the direction of North Vietnam against the South Vietnamese and United States governments during the Vietnam War. The organization had both guerrilla and regular army units, as well as a network of cadres who organized and mobilized peasants in the territory the Viet Cong controlled. During the war, communist fighters and some anti-war activists claimed that the Viet Cong was an insurgency indigenous to the South that represented the legitimate rights of people in South Vietnam, while the U.S. and South Vietnamese governments portrayed the group as a tool of North Vietnam. It was later conceded by the modern Vietnamese communist leadership that the movement was actually under the North Vietnamese political and military leadership, aiming to unify Vietnam under a single banner.