CBRN: from boots to mask
1st Lt. Michael Houston, a 61st Airlift Squadron pilot, marks a simulated contaminant as part of a chemical, biological, radiological and nuclear defense class Feb. 12, 2014, at Little Rock Air Force Base, Ark. Students are taught the use of both M8 and M9 chemical detector paper in the class. (U.S. Air Force photo by Airman 1st Class Harry Brexel)