Air Force 2nd Lt. DéJayé Herrera, 860th Aircraft Maintenance Squadron assistant aircraft maintenance unit officer in charge, holds a white board with the reason why she received the COVID-19 vaccine at Travis Air Force Base, California, Jan. 28, 2021. 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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