Following a meeting between President John F. Kennedy and South Vietnam envoy Nguyen Dinh Thuan, an agreement is reached for direct training and combat supervision of Vietnamese troops by U.S. instructors. South Vietnamese President Ngo Dinh Diem had earlier asked Kennedy to send additional U.S. troops to train the South Vietnamese Army. U.S. advisers had been serving in Vietnam since 1955 as part of the U.S. Military Assistance Advisory Group. There would be only 900 U.S. military personnel in South Vietnam at the end of 1961, but in accordance with President Kennedy’s pledge to provide American military assistance to South Vietnam, the number of U.S. personnel rose to 3,200 by the end of 1962. The number would climb until it reached 16,000 by the time of President Kennedy’s assassination in November 1963.