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The Thompson submachine gun, also known as the Tommy gun, is a .45-caliber, air-cooled, blowback-operated weapon. An American icon, U.S. infantrymen carried the Thompson in the European, North African, and Pacific theaters of World War II and during the Korean War. Firing .45 ACP cartridges at an approximate rate of 600–700 rounds per minute, the Thompson proved to be a reliable and effective weapon on the battlefield.