Maj. Eliza Hammer, a bioenvironmental engineer with the 779th Medical Group scans a simulated victim of a nuclear detonation for radiation exposure in exercise Vibrant Response at Camp Atterbury Joint Maneuver Training Center in Southern Indiana July 29. The exercise, hosted by U. S. Army North, U. S. Northern Command's Joint Force Land Component Command, brings together approximately 9,000 military and civilian personnel from across the country to simulate the response to a terrorist attack in the United States. (Photo by Sgt. 1st Class Matt Scotten, Atterbury - Muscatatuck Public Affairs)