BETHESDA, Md. (Dec. 14, 2020) U.S. Army Col. Andrew M. Barr, director of Walter Reed National Military Medical Center, is one of the first active duty service members to receive the Pfizer COVID-19 vaccine as part of Operation Warp Speed at Walter Reed National Military Medical Center. (U.S. Navy photo by Mass Communication Specialist 2nd Class Kurtis A. Hatcher)