U.S. Marines with the 15th Marine Expeditionary Unit prepare targets to be used on a range at Arta Beach, Djibouti, Dec. 18, 2012. The 15th MEU was deployed as part of the Navy Peleliu Amphibious Ready Group as a U.S. Central Command theater reserve force, providing support for maritime security operations and theater security cooperation efforts in the U.S. 5th Fleet area of responsibility.