U.S. Air Force Staff Sgt. Geoffrey Range, 633rd Civil Engineer Squadron firefighter, dons a helmet during a chemical, biological, radiological, nuclear and high-yield explosives exercise at Langley Air Force Base, Va., March 26, 2015. The exercise tested base emergency response teams ability to react to CBRNE threats. (U.S. Air Force photo by Senior Airman Kayla Newman/Released)(