BETHESDA, Md. (Dec. 14, 2020) U.S. Army Sgt. Sean Wadin places three vials of the Pfizer COVID-19 vaccine from the Kalamazoo laboratory in Michigan in a cooler to be used as the first doses of the 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)