Staff Sgt. Cole Carroll, front, and Senior Airman Vincent Miller, both 52nd Civil Engineer Squadron explosive ordnance disposal craftsmen from Spangdahlem Air Base, Germany, prepare a device designed to defeat an improvised explosive device during exercise Northern Challenge 16 in Keflavik, Iceland, Sept. 19, 2016. The exercise focused on disabling IEDs in support of counterterrorism tactics to prepare Partnership for Peace, NATO and Nordic nations for international deployments and defense against terrorism. (U.S. Air Force photo/Staff Sgt. Jonathan Snyder)