Sgt. Mackenzie tests guns at the Aberdeen Proving Grounds, MD. The photo, taken on Oct. 28, 1918, shows him working with an 8" piece out of mount on a runway. This image is not for publication and is intended for official use only.

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Size: 8321px × 5651px
Photo credit: © piemags/NSC / Alamy / Afripics
License: Licensed
Model Released: No

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