U.S. Marines assigned to the 13th Marine Expeditionary Unit embarked aboard the amphibious assault ship USS Boxer (LHD 4) climb aboard the guided missile destroyer USS Mason (DDG 87) from a rigid-hull inflatable boat during a visit, board, search and seizure exercise Jan. 12, 2014, in the Gulf of Oman. The Mason was deployed as part of the Harry S. Truman Carrier Strike Group in support of maritime security operations and theater security cooperation efforts in the U.S. 5th Fleet area of responsibility.