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The United States Army Special Forces, colloquially known as the Green Berets due to their distinctive service headgear, are a special operations force of the United States Army that are designed to deploy and execute nine doctrinal missions: unconventional warfare, foreign internal defense, direct action, counter-insurgency, special reconnaissance, counter-terrorism, information operations, counterproliferation of weapon of mass destruction, and security force assistance via seven geographically focused groups: The first two emphasize language, cultural, and training skills in working with foreign troops.