Marines assigned to the 15th Marine Expeditionary Unit (MEU) participate in a team-building water obstacle course at Arta Beach, Djibouti, Dec. 11. The 15th MEU is deployed as part of the 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. (U.S. Marine Corps photo by Cpl. Richard Sanglap-Heramis)