Timeline of United States military operations May 1949. 1948–1949: China: Marines were dispatched to Nanking to protect the American Embassy when the city fell to Communist troops, and to Shanghai to aid in the protection and evacuation of Americans. 1950–1953: Korean War: The United States responded to the North Korean invasion of South Korea by going to its assistance, pursuant to United Nations Security Council resolutions. US forces deployed in Korea exceeded 300,000 during the last year of the active conflict (1953). Over 36,600 US military were killed in action. 1950–1955: Formosa (Taiwan): In June 1950, at the beginning of the Korean War, President Truman ordered
South Korea United States Army of the US Army and Seventh Air Force of the US Air Force. They are stationed in installations at Osan, Kunsan, Yongsan, Dongducheon, Sungbuk, Camp Humphreys, and Daegu, as well as at Camp Bonifas in the DMZ Joint Security Area.<br> A fully functioning UN Command is at the top of the chain of command of all forces in South Korea, including the US forces and the entire South Korean military – if a sudden escalation of war between North and South Korea were to occur the United States would assume control of the South Korean armed forces