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Coast Guard

Capitalize in U.S. context and when preceded by name of country.

The U.S. Coast Guard is under the U.S. Department of Homeland Security (in wartime, under the Navy Department) and is one of the nation's five armed services.

            United States Coast Guard, the Coast Guard
            U.S. Coast Guardsman Jones, a Coast Guardsman, the guardsman

Other:
            Canadian Coast Guard, the coast guard
            coast guardsman Smith

See also:      AIR FORCE, ARMYMARINE CORPS, NAVY,
                        armed forces, armed services, special forces
                        MILITARY UNITS
                        Ranger, Rangers, SEAL, SEALs
                       TITLES OF PERSONS.