U.S. Marine Corps Gunnery Sgt. Julio C. Bernal prepares to swim after answering a fitness question during the 2011 Aqua Fitness Challenge at the waterworks pool in Marine Corps Air Station Iwakuni, Japan, Aug. 19, 2011. Bernal, the administration chief assigned to Marine Wing Support Squadron (MWSS) 171, and other competitors taking part in the challenge were required to answer various fitness and health questions in the pool.