It's the military, guys. I'm certain they have some kind of screening process and disclosure protocol so everyone who's involved in the body switching knows exactly what they're in for. I'm sure mistakes might get made now and then, but I would be incredibly shocked to learn that there's not some kind of protocol in place to minimize risks like the ones you're describing as much as possible. It'd be an
astronomical oversight on the military's part.
Now, if we're just talking about how weird it would be, yeah, it's totally freaky.
Anyway, I loved the episode. A nice, quiet episode to deal with all the interpersonal and just-plain-personal stuff that would naturally affect people stuck on a ship in the middle of nowhere. The showrunners have been very upfront about the fact that the show would be very character-driven so, frankly, if these kinds of episodes seem pointless to you, I kind of have to wonder why you're watching the show at all. Just my two cents.