Staff Sgt. Paul Christiansen, left, 11th Civil Engineer Squadron NCO in charge of explosive ordnance disposal operations, and Senior Airman Kevin Cohan, 11th CES EOD journeyman, prepare to approach a simulated unexploded ordnance during a chemical training exercise on Joint Base Andrews, Md., June 26, 2018. The exercise simulated a response to a damaged chemical munition. EOD Airmen are trained to detect, disarm, detonate and dispose of explosives and support and execute Department of Defense contingencies worldwide. (U.S. Air Force photo by Airman Michael S. Murphy)