A street is littered with damaged vehicles to simulate the aftermath of a nuclear explosion during Vibrant Response 13-2, at Camp Atterbury, Ind., Aug. 10, 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. Army photo by Spc. Bradley J. Wancour/Released)