Airman 1st Class Samuel Mericle performs a radial survey to determine radiation levels after a simulated explosion in front of the Base Exchange during a training scenario at the Center for National Response in Gallagher, W.Va., March 24, 2010. The Air Force District of Washington sent members of their chemical, biological, radiological, nuclear, and high yield explosives response force to the training facility in two waves for a week long training event to members learn the skills necessary to handle real world emergency situations. (U.S. Air Force photo by Staff Sgt. Renae L. Saylock)