Um, Scooter, they're called "cruise slippers" aka flip-flops.
Yeah I've made that mistake once before too, went downstairs from the bunk to drain the lizard forgetting we had a plane full of Army grunts, who seem to make it a sport on who can get the most piss all over the walls and floor and not in the toilet, in addition to let's-see-how-quick-we-can-fill-the-pisser-up Only had to learn that lesson once.
Does make me wish the C-17 had separate lavs for crew and pax (even if just torpedoes in the upstairs or something, if there was a way to make it not stink like piss anyway).