U.S. Air Force Col. Laura Baugh, 20th Medical Group commander, signs in to receive the COVID-19 vaccine 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 safely and efficiently. (U.S. Air Force photo by Airman 1st Class Destani K. Matheny)