U.S. Air Force Airman 1st Class Kailee Johnson, 20th Civil Engineer Squadron emergency management apprentice, teaches a chemical, biological, radiological and nuclear defense class at Shaw Air Force Base, S.C., Feb. 15, 2018. The emergency management flight conducts CBRN classes three days a week, three times a day. (U.S. Air Force photo by Senior Airman Destinee Sweeney)