CAMP LEATHERNECK, Helmand province, Afghanistan -- Clear Lake, Iowa, native Gunnery Sgt. Chad Trebil, the 2nd Marine Division (Forward) intelligence section operations chief, uses a rowing machine aboard Camp Leatherneck. Trebil is participating in the Leatherneck 236 Challenge, an event that raises money for the Wounded Warrior Project and the British Limbless Ex Service Men's Association. Trebil has committed to completing 944 miles through a combination of rowing, running, elliptical training and cycling before the competition’s end Nov. 10, 2011.