1965    Civilian Prime Minister of South Vietnam Phan Huy Quat resigned after being unable to work with a junta led by Nguyen Cao Ky.

1965    Nguyen Cao Ky became Prime Minister of South Vietnam at the head of a military junta; General Nguyen Van Thieu became the figurehead chief of state.

1966    Military Prime Minister of South Vietnam Nguyen Cao Ky sacked rival General Nguyen Chanh Thi, precipitating large-scale civil and military dissension in parts of the nation.

1966    After a policy dispute, Prime Minister Nguyen Cao Ky of South Vietnam's ruling junta launches a military attack on the forces of General Ton That Dinh, forcing him to abandon his command.