SPANGDAHLEM AIR BASE, Germany – During a chemical, biological, radiological and nuclear refresher class, Airmen watch as M8 chemical agent detection paper changes color Sept. 9. M8 paper detects nerve and blister agents. Airmen are shown what to look for so any found chemical contamination can be reported up the chain of command. (U.S. Air Force photo/Airman 1st Class Staci Miller)