Almost invariably, a less than ideal homelife.I am on my 2nd go-around with kids(both of my kids are in their 30s).
What I see with local schools is that the disruptive students have very poor home lives, and custodial parents who either alibi the bad behavior or just ignore the school's information altogether.
Agree 100%.What should happen is a three-strikes system. You get a warning, then a suspension, and then you go to alternative school, where you have zero rights and if you fail there, you go to juvie.
What happens in reality. Endless suspensions(1, 2-day). The disruptive kid is then placed back in the same environment where the disruption occurred before. No accountability.
Back to the OP, getting a veteran (or a veteran's spouse) into the classroom is probably not a great fix. I've known lots of guys who were great (or at least acceptable) soldiers that I would not want anywhere near a classroom.
Some might do okay, but there will be a rash of horror stories in the not too distant future of untrained public school teachers adopting really bad solutions to problems because "that was how we did things in the Navy."