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.
1965 in the Vietnam War The siege led up to the Battle of Ia Drang. A CIA intelligence estimate said that "Hanoi continues to asset its determination to press on with the war in South Vietnam despite the continuing attrition of the air war and the increase of US troops in the South." To protest the Vietnam War, a Quaker named Norman Morrison doused himself in kerosene and set himself on fire in front of The Pentagon. Morrison died. In a memorandum to President Johnson, Secretary McNamara estimated total communist forces in South Vietnam as having increased to 230,000, including 71,000 Viet Cong main force,