Vietnam War: Vietnamization: The United States Army turns over the massive Long Binh military base to South Vietnam.

Vietnamization was a failed foreign policy of the Richard Nixon administration to end U.S. involvement in the Vietnam War through a program to "expand, equip, and train South Vietnamese forces and assign to them an ever-increasing combat role, at the same time steadily reducing the number of U.S. combat troops". Furthermore the policy also sought to prolong both the war and American domestic support for it. Brought on by the communist North Vietnam's Tet Offensive, the policy referred to U.S. combat troops specifically in the ground combat role, but did not reject combat by the U.S. Air Force, as well as the support to South Vietnam, consistent with the policies of U.S. foreign military assistance organizations. U.S. citizens' mistrust of their government that had begun after the offensive worsened with the release of news about U.S. soldiers massacring civilians at My Lai (1968), the invasion of Cambodia (1970), and the leaking of the Pentagon Papers At a January 28, 1969, meeting of the National Security Council, General Andrew Goodpaster, deputy to General Creighton Abrams and commander of the Military Assistance Command, Vietnam, stated that the Army of the Republic of Vietnam (ARVN) had been steadily improving, and the point at which the war could be "de-Americanized" was close. Secretary of Defense Melvin Laird agreed with the point, but not with the language: "What we need is a term like 'Vietnamizing' to put the emphasis on the right issues." Nixon immediately liked Laird's word.

Long Binh Post is a former U.S. Army base located in Long Bình, Đồng Nai between Biên Hòa and Saigon, Vietnam. The base functioned as a U.S. Army base, logistics center, and major command headquarters for United States Army Vietnam (USARV). Long Binh Post was also unofficially known as "Long Binh Junction", influenced by the widely used initials of then-President Lyndon B. Johnson.

South Vietnam, officially the Republic of Vietnam, was a country in Southeast Asia that existed from 1955 to 1975. It first garnered international recognition in 1949 as the associated State of Vietnam within the French Union, with its capital at Saigon. Since 1950, it was a member of the Western Bloc during the Cold War. Following the 1954 partition of Vietnam, it became known as South Vietnam and was established as a republic in 1955. South Vietnam was bordered by North Vietnam to the north, Laos to the northwest, Cambodia to the southwest, and Thailand across the Gulf of Thailand to the southwest. Its sovereignty was recognized by the United States and 87 other nations, though it failed to gain admission into the United Nations as a result of a Soviet veto in 1957. It was succeeded by the Republic of South Vietnam in 1975. In 1976, the Republic of South Vietnam and North Vietnam merged to form the Socialist Republic of Vietnam.