Airman Katiha Falcon, 649th Munitions Squadron, wears a smartwatch Dec. 3, 2020, at Hill Air Force Base, Utah. Airmen from 649th MUNS are wearing watches and rings for a study with the Defense Innovation Unit that will allow detection of illnesses such as COVID-19 within 48-hours. (U.S. Air Force photo by Cynthia Griggs)