A U.S. Air Force Airman goes through a decontamination station during a simulated chemical, biological, radiological, nuclear and high-yield explosive threat exercise at Langley Air Force Base, Va., March 26, 2015. Emergency responders were tasked with safely evacuating personnel, setting up a decontamination station, entering a contaminated zone and mitigating a possible threat. (U.S. Air Force photo by Senior Airman Kayla Newman/Released)