An explosion sends a snow and chunks of ice into the air in the Eagle River Flats, Feb. 19, 2013. Cold Regions Research and Engineering Laboratory and the 716th Ordnance Company of Joint Base Elmendorf-Richardson-R detonated 60 mm mortars using C-4 to conduct tests on the effects of explosive residue on the environment surrounding the range. (U.S. Air Force Photo/ Senior Airman Sarah Trachte)