Soldiers preparing a spherical balloon for flight at the Polo Field in Washington, during World War One. Hydrogen cylinders are being used to fill the balloon with gas before it is released for a free balloon flight. Photograph taken on March 27, 1919.

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Size: 8551px × 5778px
Photo credit: © piemags/NSC / Alamy / Afripics
License: Licensed
Model Released: No

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