Airman Apprentice Jermaine Thornton, aviation boatswain's mate, turns valves to add water to a purifier to avoid overheating in a JP-5 fuel pump room aboard the aircraft carrier USS Carl Vinson. Carl Vinson and Carrier Air Wing 17 are on a three-week composite training unit exercise followed by a deployment to the U.S. 7th and 5th Fleet areas of responsibility.