U.S. Air Force Tech. Sgt. Charles Shewmaker, 633rd Civil Engineer Squadron Explosive Ordnance Disposal team lead, tightens a rope around a simulated explosive device at Langley Air Force Base, Va., Oct. 14, 2015. The EOD technicians at Joint Base Langley-Eustis, Va., are responsible for any potential explosive ordnance threats at both installations. (U.S. Air Force photo by Senior Airman Kimberly Nagle/Released)