U.S. Air Force Tech. Sgt. Greg Valdaz, of the 163d

U.S. Air Force Tech. Sgt. Greg Valdaz, of the 163d Communications Flight, 163d Attack Wing, California Air National Guard, works to put on his gas mask and hood following a simulated explosion during CBRN Defense training, Jan. 11, 2020, at March Air Reserve Base, California. The biennial training is provided by emergency managers from the 163d Civil Engineer Squadron to ensure Airmen remain familiar with the protective equipment and procedures used during chemical biological nuclear and radiological attacks. (U.S. Air National Guard photo by Staff Sgt. Crystal Housman)