US Army bicycle division, the 5th Infantry Bicycle Corps of Fort Missoula, Montana.
Fullsize image: https://diqn32j8nouaz.cloudfront.net...n_fullsize.jpg
Previously:
Finnish army combat engineers cross makeshift bridge - GIF
Three people transporting material on three bicycles - GIF
Fireman's bicycle - photo
Early 1900s bicycle ambulance - photo
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