NGS Style Manual‎ > ‎- S -‎ > ‎

special forces

Capitalize Special Forces for the U.S. Army Special Forces, also known as the Green Berets.

Lower case when used for other specialized forces:
            Rangers are the Army's rapid deployment special forces
            the SEALs are the U.S. Navy's special forces

See also:      AIR FORCEARMY, COAST GUARD, MARINE CORPS, NAVY
                        armed forces, armed services
                        MILITARY RANKS, MILITARY UNITS
                        Ranger, Rangers, SEAL, SEALs
                       TITLES OF PERSONS.