Service: Army National Guard and Army Reserve Forces Instituted: March 3, 1971 Criteria: Since March 1971 the medal required three years of service; after March 1971 it was reduced to three years Comes unmounted and with no holding bar. Service: Army National Guard and Army Reserve Forces Instituted: March 3, 1971 Criteria: Since March 1971 the medal required three years of service; after March 1971 it was reduced to three years