U.S. Air Force medical personnel assigned to Expeditionary Medical Support escort simulated injured patients away from an Army HH-60M Black Hawk helicopter during a medical evacuation in support of exercise Vibrant Response 13 at Contingency Operating Location Nighthawk at Camp Atterbury, Ind., July 30, 2012. 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. Air Force photo by Tech. Sgt. Tony Tolley/Released)