Common name used by people outside of the military to descibe one who is a member of some kind of Special Forces. Often used incorrectly and applied to many different special operations or elite military groups.
Only the Army has them in reality. Army "Special Forces" wear a dark green beret in the garison evnvironment.
My uncle was a green beret in Vietnam.
A term used by military pilots esp. the Air Force to indicate to combat controlers, targeters, and air command that the assigned or engaged target has been hit in a manner other than superficial damage.
Also adopted by some Spec. Ops forces with similar meanings.