Out of all the 10 or so people I know fairly well who are active duty or former military (Marines, Air Force, and Navy, I don't think I know any Army people unless you count National Guard).
2 have serious PTSD.
1 of those, my neighbor, was just arrested for forging pain med prescriptions--he got hooked after he was seriously wounded in combat.
4 received medical discharges from health issues directly caused by their military service (out of combat). Sure they get monthly payments, but they'd all rather not have the injuries.
All of them have spent considerable time deployed, and most of them have had serious family issues because they were away for so long.
All of their deployments were dangerous. One of my Air Force friends is a jet engine mechanic, but told me that they pulled the Marine guards out of where he was stationed, so they gave him an M16 (or maybe it was an M4, not sure what they were using at the time) and made him do guard duty.