When I was in, I served with quite a few young men that weren’t citizens but were in the process of getting their citizenship. They seemed as committed as the rest of the guys, and more committed that some subgroups that were born and raised in this country.
We served in combat together and off hand, I can recall dozens of people gaming the system or committing outright fraud trying to get out of combat but none of them were the ones that were seeking citizenship.
When you were in the military? I suspect that until not too long ago, non-citizen recruits had for the most part wanted a ticket to US citizenship and integrating. These new groups on the whole don’t even speak English, and they won’t have connections to communities. They’ll be likely to do what the feds tell them to do.