U.S. soldiers with the 83rd Chemical Battalion demonstrate how to evacuate patients during Vibrant Response 13.2 at Camp Atterbury, Ind., Aug. 13, 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)