Gunnery Sgt. Sharon Braun, 34, from Rockville, Conn., high crawls 10 yards through the muddy field near Gunner&#39;s Gym at Camp Foster, Okinawa, on Tuesday during a demonstration of the maneuver-under-fire portion of the Marine Corps&#39; new combat fitness test. Braun, an instructor at the Staff Noncommissioned Officer Academy, Headquarters Battalion, Marine Corps Base Camp Butler, volunteered to be a demonstrater.