Members from the Fort Eustis Fire Department and the 633rd Civil Engineer Squadron Emergency Management flight receive a briefing prior to entering a simulated contaminated area during a Chemical, Biological, Radiological and Nuclear exercise at Joint Base Langley-Eustis, Virginia, Oct. 10, 2019. The exercise included donning protective gear, identifying an unknown substance, going through a denomination station and more. (U.S. Air Force photo by Senior Airman Delaney Gonzales)