Philadelphia, Pa., native, Spc. Colin Gwilliam, an AH-64D Apache attack helicopter crew chief for Company A, 1st 'Attack' Battalion, 227th Aviation Regiment, 1st Air Cavalry Brigade, 1st Cavalry Division, pressure washes an Apache on the flight line at Camp Taji, Iraq, Oct. 24. The wash down is a scheduled maintenance task; one of many that the crew chiefs perform to keep the Apaches flying at their optimum performance. The Apache crew chiefs maintain the aircraft and prep it for flight before a mission.