U.S. Air Force Maj. Arnold Mosley, Citadel ROTC Detachment 765 commander, presents U.S. Air Force Senior Master Sgt. Ri'Chard Crivens, 20th Contracting Squadron superintendent, with his retirement certificate for 25 years of active-duty service. Crivens served as the senior enlisted advisor to the squadron commander on the morale, welfare, discipline, fitness and effective utilization of assigned enlisted personnel. As an additional duty, Crivens worked as an acting first sergeant for the squadron. (U.S. Air Force photo by Airman Nicole Sikorski/Released)