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ACEAbbrev. for Advanced Composition Explorer.
a pilot of a fighter airplane who is an outstanding master of air combat and who has shot down many enemy airplanes. In World War I, pilots who shot down five or more planes each were called aces. In the Great Patriotic War (1941–45) more than 150 Soviet pilots shot down from 20 to 50 hostile aircraft each; A. I. Pokryshkin and I. N. Kozhedub, both awarded the title Hero of the Soviet Union three times, shot down 59 and 62 enemy airplanes respectively. In the Soviet Air Force, pilots who have mastered to perfection the art of piloting and air fighting are sometimes also called aces.