160716-N-CL027-042 GULF OF ADEN (July 16, 2016) Chief Hospital Corpsman Percival Valenzuela, assigned to the guided-missile destroyer USS Mason (DDG 87), trains Sailors during a chemical, biological and radiological attack drill. Mason, deployed as part of the Eisenhower Carrier Strike Group, is supporting maritime security operations and theater security cooperation efforts in the U.S. 5th Fleet area of operations. (U.S. Navy photo by Mass Communications Specialist 3rd Class Janweb B. Lagazo/Released)