When I was a child we lived in the city, (small town) but Daddy had bought some property in the woods, some of it on a small river where we spent a LOT of time in the summers, basically living while camped out on the river banks.
We had electricity and fires, but "the bathroom" (during the day at least) was to just wade out into the river downstream from where the camp was (just enough to be sure no one would be swimming in what we were leaving) and do your business.
Oddly, when I was Six, and daddy had our house built about 1/4 mile up on the hill away from the river, I had to have a night light in my bedroom, Any noise, or shadows I could see made me imagine all sorts of monsters etc...
Later as I grew up, I would actually go out at night and walk the dirt road we lived on, especially if the moon was shining.
It is just a phase.
Soldier or not, he shouldn't have needed anyone to take him out to pee.
When you gotta go, you gotta go. Leave the door open so the lights from inside shine out. It's not like he were going to flood the place... right? ha ha ha