I have a friend in the military who's pretty much going through something similar to Cloud (kinda). This guy is in the special forces, and he's had all sorts of medals and honors for doing all sorts of combat related shit; one story he told me was about how his convoy in Iraq was attacked and they got in a huge gunfight, his good friend died, and he only survived by having to kill them off, while wounded waiting for backup.
Shit like that, and that's not the only thing that happened to him. Thing is, constantly having to do that shit warps your mind, and scars it. As time goes by, that sort of thing gets easier and easier, but actually integrating into normal society gets harder and harder, and the abysmal state of mental care in the military doesn't help either.
One of the biggest things he resents is people like Masamune's attitude, who think that someone who's killed people, survived battles, and seen and lived through lots of horrific shit is automatically equipped to handle the other issues, because many people go 'LOL IF YOU CAN DODGE BULLETS WHY CAN'T YOU TALK TO YOUR FAMILY'.
I mean, I know it sounds like a retarded comparison, but hmm...