111004-N-DR144-252 PACIFIC OCEAN (Oct. 4, 2011) Hull Maintenance Technician 3rd Class Robert Garcia grinds a weld smooth after installing a length of pipe for a security curtain in a work center aboard Nimitz-class aircraft carrier USS Carl Vinson (CVN 70). The Carl Vinson Strike Group is underway conducting Joint Task Force Exercise off the coast of Southern California. U.S. Navy photo by Mass Communication Specialist 2nd Class James R. Evans (RELEASED).