A 3C Smoke Candle releases a dense white smoke during a simulated chemical, biological, radiological and nuclear air assault Sept. 5, 2019, at McConnell Air Force Base, Kan. The smoke candle was used to replicate a chemical attack during CBRN training. Airmen participating in the training were tested on the actions they took during the simulated chemical attack. (U.S. Air Force photo by Airman 1st Class Marc A. Garcia)