Chief Master Sgt. Terrence Greene, command chief of Air Mobility Command, watches a 3D printer as it prints simulated ordnance during his visit to Little Rock Air Force Base, Arkansas, Oct. 31, 2019. The 19th Civil Engineer Squadron Explosive Ordnance Disposal’s new 3D printer provides the team a way to easily make simulated ordnance for training. (U.S. Air Force photo by Airman 1st Class Jayden Ford)