U.S. Air Force Lt. Col. Christine Estacion, health services administrator assigned to the 175th Medical Group, poses for a photograph at the COVID-19 mass vaccination site at the Maryland State Fairgrounds in Timonium, Md., April 15, 2021. The Maryland Air National Guard mobile vaccination support teams are providing logistical and medical support to enhance Maryland's response to the COVID-19 pandemic at sites across the state. (U.S. Air National Guard photo by Master Sgt. Christopher Schepers)
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