Lt. E. N. Jackson, Signal Corps, captured this photograph on June 23, 1918, at Fort Sill, Oklahoma. It shows a school of fire for field artillery with a tractor hauling a " gun as part of a drill. This image is not intended for publication and is marked for official use only.

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Size: 8292px × 5637px
Photo credit: © piemags/NSC / Alamy / Afripics
License: Licensed
Model Released: No

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