Quite interesting! Besides what has already been mentioned as different from the usual style WWII Military Columbia, I noticed that the lower truss rod brackets are absent, pedals appear to be possibly Torrington 10's rather then 8's, the kickstand is not the usual one seen on the Columbia nor does it appear from what I can tell to be the style used on the Military Huffman ( although it is similar). The frame pump brackets look to me like they could have been finished in a reddish color or maybe red oxide paint. The hand grips look like they could be wood. I cannot tell from these photo's whether the frame joints are welded or brazed. However, since the curved tube frame would indicate a 1941 or early 42 construction I believe that brazing would have been used. Although it is my understanding that the US Military had some of the brazed bikes welded and then all future contracted bikes welded. Both my Jan. 1942 Huffman curved tube and my Feb. 1942 Columbia curved tube G519's appear to have brazed frame joints. The photo's themselves most certainly could be original. Color photography was available during WWII. However, I believe it was more common in live filming rather then still photo's, but it was used for some still photo's. Why the bright bike parts, who knows. My guess is that the bikes were 1941-early 42 models that may have been special ordered for some reason for Bermuda and only a handful were constructed maybe using prewar stock chrome parts, who knows. Like I have said in the past. When it comes to Manufacturing during WWII all bets were off!
Regards,
Bill