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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.

Machine guns are fully automatic weapons designed to fulfill a variety of tactical roles. Soldiers use machine guns for area denial and suppressive fire in a military setting and engage ground vehicles and low-flying aircraft. 

In a civilian context, law-enforcement officers and security personnel use machine pistols and submachine guns to neutralize criminal suspects or protect clients against violent threats.