U.S. Airmen assigned to the 86th Civil Engineer Group take cover during a chemical, biological, radiological, and nuclear training exercise on Ramstein Air Base, Germany, April 12, 2018. CBRN training involves familiarization of the use of protective gear, which includes practicing putting on masks, rubber boots, gloves, and protective suits in a hazardous environment. (U.S. Air Force photo by Senior Airman Joshua Magbanua)