Wayne Hennigan, 60th Medical Group Emergency Department registered nurse, cleans an exam room inside David Grant U.S. Air Force Medical Center, March 25, 2020, at Travis Air Force Base, Calif. The emergency department, which is open 24/7, is one of many services the medical center is providing during the COVID-19 pandemic. (U.S. Air Force photo by Tech. Sgt. James Hodgman)