JOINT BASE ELMENDORF-RICHARDSON, Alaska -- Alaska Air National Guard Airman 1st Class James Fielder, a 176th Civil Engineer Squadron structures, doffs his M50 Joint Service General Protective Mask Oct. 24, 2021, during task qualification training under simulated chemical, biological, radiological, and nuclear conditions at Joint Base Elmendorf-Richardson. Headquarters Air Force requires the squadron to complete 224 tasks under CBRN conditions across the squadron's career fields. (U.S. Air National Guard photo by David Bedard/Released)