Airman 1st Class Sean Berger, right, assists airmen with gas mask inspections during chemical, biological, radiological, and nuclear defense training held at the North Carolina Air National Guard Base, Charlotte Douglas International Airport, N.C., Jan. 8, 2018. Berger is assigned to the 145th Civil Engineer Squadron. The airmen are assigned to the 145th Airlift Wing. The training is a unit wide requirement for airmen to ensure readiness, familiarity with procedures, and hands on with issued protective gear. Air Force photo by Tech. Sgt. Julianne Showalter