United States Air Force In South Korea of South Korea in resisting the invasion. United States President Harry Truman authorized General Douglas MacArthur (commander of the US occupying forces in Japan) to commit units to the battle. MacArthur ordered General George E. Stratemeyer, Commander in Chief of Far East Air Force (FEAF) based in Japan to attack invading North Korean forces between the front lines and the 38th parallel. That day, two Japan-based USAF F-82 Twin Mustangs destroyed three North Korean Air Force planes over Seoul as a C-54 Skymaster was attempting to evacuate U.S. civilians, including many women and children, from the advancing North Korean Army
United Nations Command members providing military forces and other assistance to South Korea "make such forces and other assistance available to a unified command under the United States of America". President Syngman Rhee of the Republic of Korea assigned operational command of ROK ground, sea, and air forces to General MacArthur as Commander-in-Chief UN Command (CINCUNC) in a letter (the "Pusan Letter") of July 15, 1950: On August 29, 1950, the British Commonwealth's 27th Infantry Brigade arrived at Busan to join UNC ground forces, which until then included only ROK and U.S. forces. The 27th Brigade moved into the Naktong River line west