Staff Sgt. Gabriel Franco, 374th Maintenance Squadron Fabrications Flight metals technology craftsman, closely monitors four 3-D printers as they produce the plastic base of a National Institutes of Health printable face shield to be used as an added layer of personal protective equipment at Yokota Air Base, Japan, April 2, 2020. The shield’s design relies on 50 grams of plastic to form the base of the shield, two rubber bands to secure the shield to its wearer, and a standard U.S. letter sized transparent leave to create a functioning layer of PPE. (U.S. Air Force photo by Staff Sergeant Matthew Gilmore)