.S. Air Force Senior Airman Zach Day, 633rd Civil Engineer Squadron emergency management technician, tests for simulated hazardous material during Integrated Base Emergency Response and Capability training at Langley Air Force Base, Va., Jan. 14, 2015. Airmen were given a scenario that tested their response to a potential chemical, biological, radiological, nuclear or high-yield explosives threat on the installation. (U.S. Air Force photo by Senior Airman Kayla Newman/Released)