The Kit Carson Scouts belonged to a special program initially created by the U.S. Marine Corps during the Vietnam War involving the use of former Viet Cong (VC) and People's Army of Vietnam (PAVN) personnel as intelligence scouts for American infantry units. VC and PAVN combatants who defected and became aligned with the South Vietnamese government were known as Hồi Chánh, a term loosely translated as "members who have returned to the righteous side". Only a very small number of these Hồi Chánh were selected, trained, and deployed with the U.S. Marines and later also other American and Allied (non-Vietnamese) infantry units between 1966 and 1972.

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.