160430-N-YR245-026 GULF OF ADEN (April 30, 2016) Marines, assigned to the 13th Marine Expeditionary Unit (13th MEU), participate in physical training on the flight deck of amphibious assault ship USS Boxer (LHD 4). Boxer is the flagship for the Boxer Amphibious Ready Group and, with the embarked 13th MEU, is deployed in support of maritime security operations and theater cooperation efforts in the U.S. 5th Fleet area of operations. (U.S. Navy photo by Mass Communication Specialist Seaman Craig Z. Rodarte/Released)