Roger Hilsman Jr. was an American soldier, government official, political scientist, and author. He saw action in the China-Burma-India Theater of World War II, first with Merrill's Marauders, getting wounded in combat, and then as a guerilla leader for the Office of Strategic Services. He later became an aide and adviser to President John F. Kennedy, and briefly to President Lyndon B. Johnson, in the U.S. State Department while he served as Director of the Bureau of Intelligence and Research in 1961 to 1963 and Assistant Secretary of State for Far Eastern Affairs in 1963 to 1964.

Ngô Đình Diệm was a South Vietnamese politician who was the final prime minister of the State of Vietnam (1954–1955) and later the first president of South Vietnam from 1955 until his capture and assassination during the CIA-backed 1963 South Vietnamese coup.