U.S. Army Sgt. Matthew Lei, assigned to the 565th Quartermaster Company, Fort Hood, Texas, unhooks cargo straps on a M1088 tractor truck at the Indiana National Guard Armory, Scottsburg, Ind., during Exercise Vibrant Response, Aug 2, 2012. Exercise Vibrant Response is a training event for the Defense Chemical, Biological, Radiological and Nuclear Response Force. (Official DOD photo by U.S. Air Force Tech. Sgt. Tony Tolley/Released)