CBRN Training
Staff Sgt. Thomas Preciado, 22nd Maintenance Squadron electrical and environmental systems craftsman, practices proper protective procedures throughout a simulated air attack during a chemical, biological, radiological and nuclear defense training Sept. 5, 2019, at McConnell Air Force Base, Kan. Procedures vary depending on what alarm level a zone is in. The alarm levels include green, yellow, red (ground or air attacks), and black. (U.S. Air Force photo by Airman 1st Class Marc A. Garcia)