BETHESDA, Md. (Dec. 14, 2020) U.S. Army Sgt. 1st Class Nicholas Mariott signs for the COVID-19 vaccine shipment from the Kalamazoo laboratory in Michigan to be administered 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)