Army Spc. Reglieo Hernandez, assigned to 5th Detachment, 603rd Aviation Support Battalion, conducts M4 zeroing and qualification at the Engagement Skills Trainer(EST) at Katterbach Army Airfield, Germany, Oct. 24, 2016. The EST is an indoor facility used as a unit and institutional training simulator for marksmanship. The system supports small-arms, crew-served and individual antitank weapons qualification training.

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Photo credit: © David Wa / Alamy / Afripics
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