Staff Sgt. Scott Bell, 579th Medical Operations Squadron Bioenvironmental engineer, monitors for any signs of radiation March 27 during the Air Force District of Washington Black Flag Exercise held at the Center for National Response in Gallagher W.Va. The exercise objective was to clear the scene and gather information on hazards in the area to relay information to the on-scene commander for proper planning. (U.S. Air Force photo by Staff Sgt. Christopher Ruano)