160607-N-BL637-285 PACIFIC OCEAN (June 7, 2016) Aviation Boatswain’s Mate (Equipment) Airman Zach Walker, (left), and Aviation Boatswain’s Mate (Equipment) 3rd Class Neil Crowley conduct maintenance on a catapult on the flight deck of the aircraft carrier USS Carl Vinson (CVN 70). The ship is underway conducting command assessment of readiness and training (CART) II off the coast of Southern California. (U.S. Navy Photo by Mass Communication Specialist 3rd Class Sean Castellano/Released)