Soldiers at the William Hood Dunwoody Institute in Minneapolis, Minnesota participate in a class on the theory of radio operation during World War One. This photograph was taken on December 28, 1918 and was part of the Mechanical Training Detachments program. It is labeled as "For Official Use Only."

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Size: 8527px × 5741px
Photo credit: © piemags/NSC / Alamy / Afripics
License: Licensed
Model Released: No

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