In 1961, South Vietnam signed a military and economic aid treaty with the United States leading to the arrival (1961) of U.S. support troops and the formation (1962) of the U.S. Military Assistance Command. Mounting dissatisfaction with the ineffectiveness and corruption of Diem's government culminated (Nov., 1963) in a military coup engineered by Duong Van Minh; Diem was executed. No one was able to establish control in South Vietnam until June, 1965, when Nguyen Cao Ky became premier, but U.S. military aid to South Vietnam increased, especially after the U.S. Senate passed the Tonkin Gulf resolution (Aug. 7, 1964) at the request of President Lyndon B. Johnson.