South Vietnamese forces withdraw from the town of Xuan Loc in the last major battle of the Vietnam War.

The Army of the Republic of Vietnam composed the ground forces of the South Vietnamese military from its inception in 1955 to the Fall of Saigon on 30 April 1975. Its predecessor was the ground forces of the Vietnamese National Army, established on 8 December 1950, representing Vietnam to fight in the First Indochina War against the communist Viet Minh rebels. At the ARVN's peak, an estimated 1 in 9 citizens of South Vietnam were enlisted, composed of Regular Forces and the more voluntary Regional Forces and the Popular Force militias. It is estimated to have suffered 1,394,000 casualties during the Vietnam War.

The Battle of Xuân Lộc was the last major battle of the Vietnam War that took place at Xuân Lộc, Biên Hòa Province. Over a period of 12 days between 9 and 21 April 1975, the outnumbered South Vietnamese attempted to stop the North Vietnamese forces from overrunning the town and breaking through towards South Vietnam's capital, Saigon. The Army of the Republic of Vietnam (ARVN) committed almost all their remaining mobile forces, especially the 18th Division, under Brigadier general Lê Minh Đảo, to the defence of the strategic crossroads town of Xuân Lộc, hoping to stall the People's Army of Vietnam (PAVN) advance. The battle ended when the town of Xuân Lộc was captured by the PAVN 4th Army Corps led by Major general Hoàng Cầm.

The Vietnam War was an armed conflict in Vietnam, Laos, and Cambodia fought between North Vietnam and South Vietnam and their allies. North Vietnam was supported by the Soviet Union and China, while South Vietnam was supported by the United States and other anti-communist nations. The conflict was the second of the Indochina wars and a proxy war of the Cold War between the Soviet Union and US. The Vietnam War was one of the postcolonial wars of national liberation, a theater in the Cold War, and a civil war, with civil warfare a defining feature from the outset. Direct US military involvement escalated from 1965 until its withdrawal in 1973. The fighting spilled into the Laotian and Cambodian Civil Wars, which ended with all three countries becoming communist in 1975.