A simulated unexploded ordnance rests on the ground during an exercise on Barksdale Air Force Base, La., Nov. 21, 2013. The UXO was used during an Ability to Survive and Operate scenario to help train Airmen who are involved with a Post Attack Reconnaissance team on how to properly cordon and identify the UXO. (U.S. Air Force photo/Senior Airman Joseph A. Pagán Jr.)