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, and Capt. Jeffery Paulson, the commanding officer of the medical treatment facility aboard the hospital ship USNS Mercy (T-AH 19), walk the flight deck of the Mercy 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.