Airmen from the 28th Civil Engineer Squadron explosive ordnance disposal flight advance toward the EOD exercise training site at Ellsworth Air Force Base, S.D., Oct. 6, 2015. During training, Airmen work with several types of explosives, including TNT, thermites and C-4, all of which are used for demolition. (U.S. Air Force photo by Airmen Sadie Colbert/Released)