@greatninja3 I think its more of a personality thing, being a JSDF-Soldier wont make someone into a person who kills easier necessarily and here, well, i guess you can say its because it sure feels somewhat surreal to him? As a normal person now on a futuristic spaceship and stuff, probably feels more like the game than like reality at the moment for him.
Isekai in space? Worth a look. The guy accepts his situation way to fast though. In the same scenario, I would still be expecting some pranksters or researchers to pull of my VR helmet 10 chapters in.
I've read the WN this one is ok. So far its good.
Although it's an Isekai genre but thanks to the Sci-fi tag it differentiate from other mass produce fantasy RPG isekai.
I'd recommend on reading this.