Vintage photo (1981) of U.S. Army Green Berets assigned to Charlie Company, 2nd Battalion, 7th Special Forces Group, dressed in arctic camouflage, on a training patrol.
Note the M16A1 rifles carried by the special forces soldiers - just one of several rifles and carbines based on the AR-15 design that have been used by the U.S. military.
AR-15 variants in current use with the Green Berets include the M4a1 and CQBR carbines