U.S. Air Force Staff Sgt. Audra Sensor, 633rd Medical Group technician, administers a COVID-19 vaccination for U.S. Air Force Tech. Sgt. Kimberley Mitchell-James, 633rd Medical Group medical maintenance operations NCO in charge, at Joint Base Langley-Eustis, Virginia, Jan. 8, 2021. Vaccinations are voluntary and prioritized in a tiered system with healthcare workers and first responders being the first eligible to receive them. (U.S. Air Force photo by Senior Airman Alexandra Singer)