>>2975785>>2975825>>2975827As far as I know, just a Japanese camera made while under US occupation. I don't think the US has ever considered territories to be "part of the US" while occupied, though I may be wrong.
>>2975813>>2975823More speculation here, but I know that some of these "rifle cameras" were actually made for gunnery training, not for taking better photos. Basically it was a way for trainees, usually aircraft gunners, to learn to properly lead targets and for their instructors to score them, without having to shoot up shitloads of expensive flying targets with real ammo. Here's a similar thing based on a Lewis Gun.
The Leica one is weird because it's more like a normal handheld rifle, but gunners in training did a lot of skeet shooting with normal shotguns and maybe Leica thought there was a market for a camera alternative. (And the fact that there wasn't could explain why so few were ever made.)
On the other hand, it could easily be intended for exactly the same purpose as the Foto-Snaiper.