My pop was in the D-Day invasion, as part of a medical supply depot. He packed a camera with him - a KW Pilot Super. So one of these would be authentic to the invasion, although not US-made.

http://camera-wiki.org/wiki/Pilot_Super

It was, coincidentally, the first camera I ever used. I didn't realize the significance; after all, what does a 5-year old kid know about war?