Two U.S. Soldiers assigned to the 52nd Weapons of Mass Destruction-Civil Support Team, Ohio National Guard discuss their sampling results with a U.S. Army North (Fifth Army) observer controller, left, during a simulated chemical, biological, radiological or nuclear incident scenario as part of the Vibrant Response 13-2 training exercise at the Muscatatuck Urban Training Center in Butlerville, Ind., July 31, 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 National Guard photo by Staff Sgt. Alexandria Brimage-Gray/Released)