Marines assigned to the 13th Marine Expeditionary Unit (13th MEU) engage in arm manipulation training aboard the amphibious assault ship USS Boxer (LHD 4). Boxer is underway as part of the Boxer Amphibious Ready Group, comprised of Boxer, the amphibious transport dock ship USS New Orleans (LPD 18), the amphibious dock landing ship USS Harpers Ferry (LSD 49) and the 13th MEU. (U.S. Navy photo by Mass Communication Specialist 2nd Class Kenan O'Connor/Released)