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 relations of the most pro-American nations in the world. The new US Ambassador to South Korea arrived in Seoul on July 7, 2018. The post had been vacant since President Donald Trump took office in January 2017. Harry Harris, a former head of the US military's Pacific Command, has expressed his resolve to work as an ambassador to strengthen the alliance between the United States and South Korea. Leaders of South Korea and the United States from 1950 Cross-border skirmishes and raids at the 38th Parallel escalated into open warfare when the North Korean forces invaded South Korea on June 25,