Air Force Tech. Sgt. Cornell Turrentine, center right, reviews the use of the gas mask drinking tube 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. Turrentine is assigned to the 145th Civil Engineer Squadron. Air Force photo by Tech. Sgt. Julianne Showalter