Militaries ought to do a better job of screening out the people who take that too far, though. You want people who are dutiful, but not mindless drones (that's how you get the "just following orders" types who'd willingly commit atrocities) or power trippers.
I'm not sure we want much psychopathy in the armed forces. Yeah, to some extent you need to avoid being too sensitive (since you know the enemy is out to kill you), but you do want someone who can empathize with innocents and act out of compassion rather than cold logic.
Yeah, but regardless of your psychology going into it, there is no doubt it's going to change you as a person.
I was talking with a client of ours last week that is very much a military family. Her husband has and always will be in the military. Been to Afghan + Iraq multiple times. He is pretty much the top ranking that you can get for his position from what I gathered. The guy literally wont quit regardless of any money or retirement or anything. The only way he will stop is if they actively kick him out.
She said everytime he comes back it's always a hard adjustment - just imagine an environment every. single. day where everyone is under your command. They obey you, they are under your orders. Then you come home and a dickhead cuts you off while driving.
You definitely need to have a certain brain for that stuff - and either way I can't imagine how rough it is to adjust.