A Marine assigned to the Chemical, Biological Incident Response Force hammers wooden bracing together to support a collapsing building during a Vibrant Response 13 field training exercise at the Muscatatuck Urban Training Center, Ind., July 29. The CBIRF unit was responsible for decontaminating, treating and evacuating displaced civilians in the collapsed building during the simulated training exercise. (Official DOD photo by U.S. Army Sgt. Terence Ewing/Released)