Engineman 2nd Class Amell Trevino, from Edinburg, Texas, replaces a head gasket on an engine aboard the amphibious transport dock ship USS Mesa Verde (LPD 19.) Mesa Verde Sailors and 22nd Marine Expeditionary Unit Marines are participating in a composite training unit exercise in preparation for deployment. (U.S. Navy photo by Mass Communication Specialist 3rd Class Shannon M. Smith/Released)