South Vietnamese Generals Lâm Văn Phát and Dương Văn Đức fail in a coup attempt against General Nguyễn Khánh.

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.

Lâm Văn Phát was a Major general in the South Vietnamese Army of the Republic of Vietnam (ARVN). He is best known for leading two coup attempts against General Nguyễn Khánh in September 1964 and February 1965. Although both failed to result in his taking power, the latter caused enough instability that it forced Khánh to resign and go into exile.

Lieutenant General Dương Văn Đức was a Vietnamese army officer. He is best known for leading a coup attempt against General Nguyễn Khánh on 14 September 1964. He was a supporter of the Đại Việt Quốc Dân Đảng, a Roman Catholic political movement.

The September 1964 South Vietnamese coup attempt took place before dawn on September 13, 1964, when the ruling military junta of South Vietnam, led by General Nguyễn Khánh, was threatened by a coup attempt headed by Generals Lâm Văn Phát and Dương Văn Đức, who sent dissident units into the capital Saigon. They captured various key points and announced over national radio the overthrow of the incumbent regime. With the help of the Americans, Khánh was able to rally support and the coup collapsed the next morning without any casualties.