Airman 1st Class Matthew Allen, a defender for the 442d Security Forces Squadron, equips his gas mask before engaging in a practice course of fire during a Combat Arms Training and Maintenance course, Aug. 11, 2020, Whiteman Air Force Base, Mo. CATM is a wing-level program derived from Security Forces set to train military personnel on the use, safety and maintenance of firearms. (U.S. Air Force Photo by Senior Airman Alex T. Chase)