Exercise for chemical, biological, radiological & nuclear

U.S. Marine Corps Cpl. Chris R. Gerard and Sgt. George Calloway, both with the Chemical Biological Incident Response Force, 2nd Marine Expeditionary Force, carry a simulated casualty during exercise Vibrant Response at Muscatatuck Urban Training Complex, Ind., March 14, 2011. 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. (DoD photo by Staff Sgt. Matt Scotten, U.S. Army/Released)