U.S. Air Force Staff Sgt. Audra Sensor, 633rd Medical Group technician, receives the first COVID-19 vaccine at Joint Base Langley-Eustis, Virginia, Jan. 7, 2021. Vaccinations are voluntary and prioritized in a phased approach beginning with medical, security forces personnel and first responders. (U.S. Air Force photo by Senior Airman Zoie Cox)