U.S. Airmen with the 633d Civil Engineer Squadron work through a “Warm Zone” station of the Chemical, Biological, Radiological and Nuclear exercise at Joint Base Langley-Eustis, Virginia, Feb. 17, 2022. A warm zone, the contamination reduction zone, is the transition area between the exclusion and support zones. (U.S. Air Force photo by Airman 1st Class Chloe Shanes)