History of Vietnam since 1945 unstable as no government could keep power for long. There were more coups, often more than one every year. The Communist-run Viet Cong expanded their operation and scored some significant military victories during this period. In 1965, US President Lyndon Johnson sent troops to South Vietnam to secure the country and started to bomb North Vietnam, assuming that if South Vietnam fell to the Communists, other countries in the Southeast Asia would follow, in accordance with the domino theory. Other US allies, such as Australia, New Zealand, South Korea, Thailand, the Philippines, and Taiwan also sent troops to South Vietnam.
CIA activities in Vietnam the military and diplomats, and Lansdale was no longer involved with Vietnam. On May 11, 1961, President Kennedy gave the authorization to begin "a program for covert actions to be carried out by the Central Intelligence Agency which would precede and remain in force after any commitment of US forces to South Vietnam." Kennedy was giving the CIA the job of preparing for the eventual landing of US troops. Later that year, in October 1961 the Director of Central Intelligence Allen Dulles approved a massive counterinsurgency program with the goal of launching a "village defense program in the lightly populated