For what it's worth, though you're clearly not eligible for American VA benefits if you served in a non-American military, the legal definition of a "veteran" in the US is anyone who performed any active-duty military service at all. You don't need to see combat to be considered a veteran. You're obviously less likely to end up with PTSD if you don't see combat, though you'd be surprised. Training can be rough and a fairly high number of people end up being assaulted and/or raped while in garrison, and of course several US military installations have also been the site of mass-shooting events.

Anyway, if this has happened your entire life, I wonder if there is really anything you can do about it. That seems distinct from trauma-induced. This seems to describe my sister. From as early as I can remember, so at least when she was as young as 3, she was waking up in cold sweats pretty regularly having dreams the entire family except her was murdered in the middle of the night. Myself, I can't remember ever having a single nightmare my entire life, and I served in the Army during Iraq and Afghanistan and even outside of the military had a few near-death encounters. Some people are just a lot more predisposed to worry than others. It's not necessarily a bad trait, either. I'm reasonably sure the high number of near-death experiences for me is because I'm way too prone to idiotic risks because I never believe anything bad will happen. And always surviving just reinforces that even though I know rationally I just got lucky. Humanity exists right now because my ancestors were mostly a lot more anxious than I am.