Mike Walsh, a research mechanical engineer with the Cold Regions Research and Engineering Laboratory of Hanover, N.H., opens a plastic bag containing a block of ice that will be used as a control subject in a high order detonation test in Eagle River Flats, Feb. 19, 2013. CRREL 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/ Airman 1st Class Omari Bernard)
Airman 1st Class Omari Bernard
Taken on 19 February 2013
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