Air Force Staff Sgt. Cole Carroll sweeps an area with a mine detector during Northern Challenge 16 at Icelandic Coast Guard Keflavik Facility, Iceland, Sept. 19, 2016. The exercise focused on disabling improvised explosive devices to support counterterrorism tactics to prepare NATO and Nordic nations for international deployments. Carroll is assigned to the 52nd Civil Engineer Squadron. Air Force photo by Staff Sgt. Jonathan Snyder