Air Force Capt. Marshall Neubauer, USAF Reserve Officers' Training Corps Assistant Professor of Aerospace Studies, holds up the reminder card to return to receive the second COVID-19 inoculation Jan. 8, 2021 at Travis Air Force Base, California. The vaccine requires two doses per person, separated by about four weeks between doses. It is designed to protect personnel against the coronavirus, and officials are encouraging all prioritized personnel to take the vaccine as it becomes available.

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