BETHESDA, Md. (Jan. 14, 2021) Hospital Corpsman 3rd Class Charles Cambern holds up a numbered sign as patients circle through to receive the COVID-19 vaccine as part of Operation Warp Speed at Walter Reed National Military Medical Center. Operation Warp Speed is a national initiative to accelerate the development, production and distribution of COVID-19 vaccines, therapeutics and diagnostics. (U.S. Navy photo by Ricardo J. Reyes)