United States Army Special Forces

The United States Army Special Forces, known in the United States simply as Special Forces or SF, is an elite special operations force of the U.S. Army trained for guerrilla warfare, unconventional warfare, and special operations. SF was founded in 1952 by Colonel Aaron Bank, and its members are informally known as "the Green Berets", because of the unit's distinctive green beret headgear. Their official motto is De Oppresso Liber (Latin: "To free the oppressed"), a reference to one of their primary missions to train and assist foreign indigenous forces.
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Noun
1. a division of the United States Army that is specially trained for guerilla fighting
(synonym) Special Forces, U. S. Army Special Forces
(hypernym) division
(part-holonym) United States Army, US Army, U. S. Army, USA
(member-meronym) Green Beret