Air Force 2nd Lt. Mario Fernandez, 60th Aerial Port Squadron officer, holds a white board with the reason why he 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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