U.S. Airmen assigned to the 86th Civil Engineer Group inspect data-collecting paper for contamination during a training exercise on chemical, biological, radiological, and nuclear defense on Ramstein Air Base, Germany, April 12, 2018. During CBRN training, Airmen learn to distinguish between different kinds of threats and their physiological effects. (U.S. Air Force photo by Senior Airman Joshua Magbanua)