Airmen give and receive the COVID-19 vaccine at Barksdale Air Force Base, Louisiana, Sept. 9, 2021, in accordance with the Secretary of Defense memorandum dated Aug. 24, 2021. Vaccination of Airmen and Guardians enhances force health protection and readiness. This action is consistent with DoD mandatory vaccination programs for service members to address other health threats such as seasonal influenza. (U.S. Air Force photo by Senior Airman Jovante Johnson)