Colonel E. N. Johnstone (left) and Major W. F. Boyer of the Chemical Warfare Service, Offensi Division, during a tour in Tours, Indre et Loire, France. Photograph taken on November 29, 1918. Image number 37744. Source: Photographs of American Military Activities during World War One.

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Photo credit: © piemags/NSC / Alamy / Afripics
License: Licensed
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