An "ace" is a pilot who has shot down five or more enemy aircraft. The top jet ace in U.S. Air Force history is Joseph C. McConnell, a "Triple ace" who shot down sixteen MiG fighters during the Korean War. He did this over a four-month period in 1953—including downing three MiGs on his last mission before returning to the United States. For his actions in combat, he was awarded the Distinguished Service Cross and the Silver Star. In 1954, he was killed while test piloting an F-86H fighter-bomber. His record as top jet ace still stands.