U.S. Air Force Airmen with the 633rd Civil Engineer Squadron Emergency Management flight prepare CS gas, commonly referred to as tear gas, for training at Joint Base Langley-Eustis, Virginia, Aug. 29, 2019. The Airmen who received this hands-on training were learning to become instructors for the gas chamber course. (U.S. Air Force photo by Senior Airman Delaney Gonzales)