Definition of Green Beret noun from the Oxford Advanced Learner's Dictionary

 

Green Beret

 noun
noun
BrE
 
; NAmE
 
 
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a member of the US army Special Forces Culture The Green Berets (whose name comes from the green caps they wear) fought a lot in the tropical forests of Vietnam during the Vietnam War. The Green Berets (1968), with John Wayne, was a film about that war.
See the Oxford Advanced American Dictionary entry: Green Beret