A Mikoyan-Gurevich MiG-15bis in a hangar at Kimpo Air Base, South Korea. A defecting North Korean pilot, Lieutenant No Kum-Sok, flew it to Kimpo, 21 September 1953. It was examined and test flown by Air Force test pilot Major Charles E. Yeager. The United States offered to return the airplane, but the offer was ignored. In 1957, the MiG-15 was placed in the collection of the National Museum of the United States Air Force, Wright-Patterson AFB, Ohio. (U.S. Air Force).