U.S. Air Force Capt. Geoffrey Johnston, 60th Dental Squadron prosthodontist, holds a face shield prototype attached to a pair of medical binocular loupes April 13, 2020, at Travis Air Force Base, California. The 60th Aerospace Medicine Squadron Bioenvironmental Engineering Flight, 60th DS, 60th Air Mobility Wing Phoenix Spark innovation cell and 60th Maintenance Squadron collaborated to design personal protective equipment for David Grant USAF Medical Center. (U.S. Air Force photo by Heide Couch)