U.S. Navy Vice Adm. Matthew L. Nathan, right, the surgeon general of the Navy and chief of the Navy's Bureau of Medicine and Surgery, shakes hands with a Sailor aboard the hospital ship USNS Mercy (T-AH 19) in Pearl Harbor, Hawaii, June 29, 2014, during the Rim of the Pacific (RIMPAC) 2014 exercise. RIMPAC is a U.S. Pacific Fleet-hosted biennial multinational maritime exercise designed to foster and sustain international cooperation on the security of the worlds oceans.