U.S. Airmen wait in line for the COVID-19 vaccine at the 20th Medical Group at Shaw Air Force Base, South Carolina, Dec. 4, 2021. The Air Force began administering the COVID-19 vaccines earlier this month to essential personnel as part of Operation Warp Speed, which is the Department of Defense’s initiative to vaccinate Americans both safely and efficiently. (U.S. Air Force photo by Airman 1st Class Destani K. Matheny)