Master Sgt. Andrew Burgos, 436th Operational Medical Readiness Squadron mental health flight chief, displays a sign stating why he volunteered for the COVID-19 vaccine Jan. 20, 2021, at Dover Air Force Base, Delaware. Burgos was among the first Team Dover front-line workers who voluntarily received the vaccine in accordance with Department of Defense guidance. The vaccine was granted emergency use authorization by the U.S. Food and Drug Administration for use in prevention of COVID-19. (U.S. Air Force photo by Roland Balik)

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Photo by: GS-09 / Roland Balik |  VIRIN: 210122-F-BO262-1055.JPG