Vietnam War, Green Beret

The United States Army Special Forces or SF, is an elite special operations force trained for guerrilla warfare, unconventional warfare, and special operations. SF was founded in 1952 by OSS Jedburgh Colonel Aaron Bank known as the father of the Special Forces, 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 Liberate the Oppressed"), a reference to one of their primary missions to train and assist foreign indigenous forces.

The Green Berets became popular thanks to the 1968 film featuring John Wayne titled "The Green Berets".