 Complete the following phrase:  General Trần Thiện Khiêm ; 15 December 1925  24 June 2021 was a Vietnamese soldier and politician, who served as an officer in the Army of the Republic of Vietnam during the Vietnam War. He was born in Saigon, Cochinchina, French Indochina now Vietnam. During the 1960s, he was involved in several coups. He helped President Ngô Đình Diệm put down a 