West Virginia Air National Guard Airmen and Aircrew members from the 167th Airlift Wing, Shepherd Field, W. Va., take shelter in a simulated bunker during an attack on Sept. 23, 2004. In the background sits one of the units C-130 Hercules cargo aircraft. The AIRMAN is participating in Readiness Safeguard Ability To Survive and Operate (ATSO) training exercise at the Combat Readiness Training Center, Volk Field, Wis. (U.S. Air Force photo by Technical Sergeant Rob Jensen) (Released)