Ngô Quang Trưởng was an officer in the Army of the Republic of Vietnam (ARVN). Trưởng gained his commission in the Vietnamese National Army in 1954 and moved up the ranks over the next decade, mostly in the Airborne Brigade. In 1966, Trưởng commanded a division for the first time after he was given command of the 1st Division after helping to quell the Buddhist Uprising. He rebuilt the unit after this divisive period and used it to reclaim the city of Huế after weeks of bitter street fighting during the Tết Offensive.

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 in April 1975. 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.