Master Sgt. Jaclyn Carlisle, non-commissioned officer of flight medicine, 173rd Air Refueling Squadron, registers personnel receiving the new COVID-19 vaccine, Jan. 5, 2020, at the Nebraska National Guard air base in Lincoln. The Department of Defense began limited delivery of the COVID-19 vaccine to medical facilities for voluntary vaccination to mission-essential personnel based on the Department of Defense’s COVID-19 roll-out plan. (Nebraska

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