U.S. Air Force Airman 1st Class Alex McClendon, 633rd Aerospace Medicine Squadron bioenvironmental engineer technician, prepares to enter a simulated contaminated area during Integrated Base Emergency Response and Capability training at Langley Air Force Base, Va., Jan. 13, 2015. IBERCT was designed to ensure Joint Base Langley-Eustis is protected from potential chemical, biological, radiological, nuclear and high-yield explosive threats. (U.S. Air Force photo by Senior Airman Kayla Newman/Released)