Airman 1st Class Nathan McMaster, 366th Civil Engineer Squadron emergency management technician, teaches a class on chemical, biological, radiological and nuclear defense (CBRN), March 20, 2020, at Mountain Home Air Force Base, Idaho. Airmen learn about CBRN as a part of required combat skills training, increasing their readiness. (U.S. Air Force photo by Senior Airman Tyrell Hall)

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Photo by: Senior Airman Tyrell Hall |  VIRIN: 190320-F-AE594-235.JPG