Guys, let me clarify something to help you better understand the "lore" of this story, if I can put it that way.
The main character is in the military, that's true, but I never specified anywhere that he's on a life-threatening mission or deployed overseas. I didn't even mention the country where this is taking place, okay? From the dialogues, you should have noticed that he's not carrying out extremely difficult or dangerous operations - instead, he's mostly confused about why they even sent him on this assignment in the first place. Most of his time is spent on physical training, not in mortal danger.
In this story, the army is presented primarily as a source of distance—an obstacle that keeps the couple apart—rather than a real threat that something bad might happen to the protagonist. You could argue that this makes him a "bad" soldier who's basically getting paid for nothing - fair enough. But I wouldn't want that to be the main thing you focus on.
Why do I see it this way? Guys, we're all from different corners of the world, with different life circumstances, and real life is often complicated enough on its own. We already have plenty of challenges in reality, and I don't want to touch a raw nerve or upset any particular group of people. Whether that's good or bad is up to you to decide, but if the hero were truly in extreme danger, having the NTR tag from the start would feel like a terrible choice right off the bat.
Just keep in mind that this particular guy isn't out there completing the toughest missions around the globe - he simply wants to get back to his beloved wife as soon as possible, while she's waiting and hoping he'll change his line of work so he can stay by her side.
Now, about the language: English isn't my native language, so some of my phrasing might seem awkward, silly, or funny to you. You can cut me some slack for that, or consider it a serious flaw that's not worth your time - it's entirely up to you. However, I think it's important to remember that I'm the one using a translator to get my thoughts across to you, not the other way around, so maybe it's not as bad as it could be.