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Although labelled "Camp Evans" I believe this photo postcard was taken at the site of what would become Camp Lewis, later Fort Lewis, in Tacoma, Washington. Two interesting things to note: this probably does not represent a racially integrated military unit, but it does seem to show black and white soldiers socializing in camp; and, of course, there's a bicycle.
Another scan sent from work by my lovely wife, who always sends me cool stuff to completely derail my own workday.