Soldiers at Rockwell Field in San Diego, California, testing the avio phone in August 1915. This image was taken by an official photographer on June 10, 1918. The avio phone was being evaluated for official use, and this photo is marked as "For Official Use Only" with the reference numbers 20763 and 382.

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Size: 8448px × 5732px
Photo credit: © piemags/NSC / Alamy / Afripics
License: Licensed
Model Released: No

Keywords: 10, 111-sc, 111-sc-20763, 1915, 1918, activities, american, au, aviation, aviophone, california, commanding, diego, field, issued, june, military, notes, officer, official, photographer, photographs, rockwell, san, sunder, takes, testing, war, world