U.S. soldiers assigned to the 520th Medical Company, 56th Medical Battalion, 62nd Medical Brigade prepare a simulated patient for evacuation during exercise Vibrant Response 13-2 at Camp Atterbury Joint Maneuver Training Center, Edinburgh, Ind., Aug. 14, 2013. Vibrant Response is a U.S. Northern Command-sponsored field training exercise for chemical, biological, radiological, nuclear and high-yield explosive consequence management forces designed to improve their ability to respond to catastrophic incidents. (U.S. Air Force photo by Airman 1st Class Logan Brandt/Released)