U.S. Navy Damage Controlman 3rd Class Alex C. McNight, right, assigned to Damage Control Division, Engineering Department aboard the aircraft carrier USS George H.W. Bush (CVN 77), measures the face of Aviation Electrician's Mate Airman Apprentice Anthony Arines, assigned to Strike Fighter Squadron (VFA) 15, during a gas mask fit test in the ship's hangar bay under way in the Atlantic Ocean Oct. 5, 2010. Bush is currently conducting training at sea.