Master Sgt. Sean Massar, 507th Air Refueling Wing command post controller, receives his first of a two-dose COVID-19 vaccine series from Senior Airman Caleb McCain, 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 to protect their health, their families, their community, and lower the public health risks associated with the COVID-19 pandemic. (U.S. Air Force photo by Tech. Sgt. Lauren Kelly)