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Tech. Sgt. Paul Willson, 341st Civil Engineer Squadron explosive ordnance disposal NCO in charge of quality assurance, holds a 3-D printed mortar after a training procedure Nov. 21, 2016, at Malmstrom Air Force Base, Mont. Before obtaining the printer, EOD had to effectively utilize resources by conserving their minimal inventory of simulated explosives. Having the printer allows the flight to train more realistically and replace needed parts faster and cheaper than before. (U.S. Air Force photo/Airman 1st Class Daniel Brosam)