U.S. Navy Aviation Boatswain's Mate 3rd Class Erin Dixon carries an aircraft chock while directing the starboard side movement of an MV-22 Osprey aircraft on the flight deck aboard the amphibious assault ship USS Iwo Jima under way in the Arabian Sea July 3, 2012. Iwo Jima and embarked U.S. Marines assigned to the 24th Marine Expeditionary Unit are supporting maritime security operations and theater security cooperation efforts in the U.S. 5th Fleet's area of responsibility.