THAT!!! WW I and II vets came home, and went forward with life and living. I have known a few vets that milk PTSD like a cow. It's their "go to" excuse for everything.
The reason for this is that our military services generally do an excellent job of weeding out the psychologically fragile during boot camp - and combat vets usually consider themselves lucky and grateful to be alive.
PTSD is the normal human reaction to excesses of fear, sleeplessness, and shock at seeing things that most other young people will never see in their lifetimes. Everyone I knew who had served in direct combat has some level of PTSD - it's something that no amount of counseling, or drinking will really change much. It just takes time and finding a wife who supports you through the process - and doesn't get embarrassed when you dive under the table when there's an unexpected pop nearby.