Special forces (SF) and special operations forces (SOF) are generic terms for elite highly-trained military teams/units that conduct specialized operations such as reconnaissance, unconventional warfare, direct action and counter-terrorism actions. In the United States, the term special operations forces (SOF) is used instead of special forces
as special forces can refer to a specific unit, the United States Army Special Forces, commonly called the "Green Berets". It also refers to units classified as SOF units such as Civil Affairs and Psychological Operations which are separate from Special Forces. By the terms of their definition, special forces are small-scale, clandestine, covert or overt military operations of an unorthodox and frequently high risk nature, undertaken to achieve significant political or military objectives in support of foreign policy.” Some special forces operations, such as counter-terrorism actions, may be carried out domestically under certain circumstances. Special forces units are typically composed of relatively small groups of highly-trained personnel equipped with armament, operating under principles of self-sufficiency, stealth, speed, and close