Senior Airman Latianna Foster, 507th Security Forces Squadron defender, receives her first of a two-dose COVID-19 vaccine series from Senior Airman Maria Diaz, 507th Medical Squadron medical technician, Feb. 7, 2021, at Tinker Air Force Base, Oklahoma. More than 250 Reservists voluntarily received the first dose of the two-part Moderna COVID-19 vaccine series during the February unit training assembly. (U.S. Air Force photo by Tech. Sgt. Lauren Kelly)