American soldiers at Fort Sill, Oklahoma, being trained to take daily meteorological observations by the Meteorological Service of the US Signal Corps. These observations are vital for the air services during World War I. The photograph was censored and released by the Censor on June 21, 1918.

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Size: 8030px × 5352px
Photo credit: © piemags/NSC / Alamy / Afripics
License: Licensed
Model Released: No

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