U.S. Air Force Staff Sgt. Joshua Fredrick, 633rd Civil Engineer Squadron noncommissioned officer in charge of emergency management training, teaches Airmen about decontamination procedures during Prime Base Engineer Emergency Force day training at Joint Base Langley-Eustis, Virginia, Jan. 25, 2018. Fredrick also explained the different color codes for the M8 and M9 paper. (U.S. Air Force photo by Airman 1st Class Anthony Nin Leclerec)