U.S Air Force bio-environmental technicians with the 633rd Aerospace Medicine Squadron simulate decontaminating a cordoned area during an aircraft incident exercise at Joint Base Langley-Eustis,Va., July 11, 2017. The exercise was used to inspect and evaluate base capabilities, while also allowing Airmen to learn from their mistakes, better preparing them for real-world scenarios. (U.S. Air Force photo/Staff Sgt. Carlin Leslie)