Escalation of forces – increase of U.S. troops by President Lyndon B. Johnson.
Tet Offensive- North Vietnamese and other forces carried out surprise attacks on American forces in South Vietnam.
Vietnamization – change in U.S. Military policy in Vietnam by President Nixon that failed. This policy focused on equipping, training, and giving more responsibility for combat actions to local South Vietnamese forces. At the same time, U.S. ground forces started to be drawn down and transitioned to more of an advisory role.
Fall of Saigon – pivotal moment at the end of the Vietnam War; U.S. forces had been ordered out of the country; after their withdrawal, the North Vietnamese Army marched into Saigon and took control of the country.