Yes, and another thing my son said was frustrating is that he wanted to show us pictures, videos, etc of his time there, and after just a few minutes we were stressed out by the images and didn't want to see more. And yet he wanted us to look at hundreds of them, for hours at a time. All we wanted to do when he got back was feed him (he had lost a ton of weight), drive him around to all his old familiar haunts, and hug him.
When we would drive him around, he would jump at every noise in traffic, and cringe at every piece of trash on the side of the road. He was extremely jumpy and irritable. He was drinking like a fish.
This stage lasted for several weeks. Eventually I figured out that if he didn't show me those photos and videos, he was going to explode. So I made myself sit down with him and look at these for hours on end, and then we sat up drinking and talking for many more hours.
The video that sticks out the most in my mind is one he made by strapping a camera onto his helmet during a patrol through the streets of a village with another soldier. The tension was unbelievable. The furtive people in doorways, eyes looking out windows, the direction of the camera as he looked from left to right, at piles of trash, into houses, into shops and alleyways, the discussion he was having with his fellow soldier - it was nerve wracking. And this was a nearly daily occurrance.