U.S. Navy Aviation Ordnanceman Airman Tiffany Wilchek removes a firebox on an MH-60S Knighthawk helicopter from Helicopter Sea Combat Squadron (HSC) 8 May 17, 2011, aboard aircraft carrier USS John C. Stennis (CVN 74), under way in the Pacific Ocean. The ship was participating in a composite training unit exercise off the coast of Southern California.