They can charge for the room. Why not make that mandatory? Makes business sense.
It's also part of the tradition in North America. It may not be the military but learning to live with people, maybe people you really don't like, is a life experience. And many people look back fondly at that, which they would not have chosen voluntarily.
I don't have a desktop at hand to try and it doesn't work on mobile using the desktop site: can you drag pictures into the Photos folder from your Drive on desktop?
If that doesn't work or you've already tried that I'm afraid your SOL. You'll probably need to bounce them off a hard drive into the photos backup.