Additional awards of the Army and Air Force Commendation Medals are denoted by bronze and silver oak leaf clusters. The Navy and Marine Corps Commendation Medal and Coast Guard Commendation Medal are authorized gold and silver 5/16 inch stars to denote additional awards. The Operational Distinguishing Device ("O" device) is authorized for wear on the Coast Guard Commendation Medal upon approval of the awarding authority. Order of Precedence is following the Air Medal but before the Prisoner of War Medal and all campaign medals. Each of the military services also awards separate Achievement Medals which are below the Commendation Medals in precedence.