U.S. Air Force Lt. Col. Aaron Weaver, 60th Aerospace Medicine Squadron Bioenvironmental Engineering Flight commander, tests the fit of a plastic face shield on a pair of medical binocular loupes worn by Capt. Geoffrey Johnston, 60th Dental Squadron prosthodontist, April 13, 2020, at Travis Air Force Base, California. The 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