After so and so much time in Russian POW camp, he got moved to some US prison (camp?). Only after that he was released.
They had to work a lot as prisoners, so I guess both sides wanted their share of work from war prisoners and so he first had to be in a Russian camp and then later in a US managed camp.
In documentaries you can also see, that some more qualified people got moved to "in the middle of nowhere" in Russia and Siberia as "experts" to help with building something up, where before German soldiers had destroyed. If you are willing, you can watch some kind of war documentary at least every second day in Germany. After you have seen your 20th documentary, you might get tired of it. However, many of the old people watch that stuff over and over. I guess it is because of the huge impact those events had on so many lives in their youth and to keep in mind how horrible things went. Perhaps also to try and get some kind of understanding of how a society could screw up so badly. And perhaps they want to know about all the evil things that happened, which they did not know about. The things that happened outside of the eyes of most people.
There is no lack of educational material at least. Just a day ago I saw an announcement on TV for another documentary for one of the almost infinite sides of that history: A documentary showing photographs and short clips taken by hobby photographers in 44 or 45 or so, showing a deceptive calm in some places in Germany, basically before things rolled all the way back, with only few indications of impending doom. You see, there is always something TV stations can send about it. Every little detail can be looked at and a documentary made about it.
When my grandfather had was called into the army, he was 15 years old. Send to the east, to fight a war. Many young people of that generation never finished school before entering the army. Basically children soldiers. They had to go back to school, as adults, when they returned from war and imprisonment. Re-education and further education. Imagine that contrast. I think it must have been hard for many of them, with post war trauma and all those memories.
He was either extremely fortunate, or unfortunate, depending on how you look at it. Came into a field hospital with a headshot wound, but somehow survived. The doctor told him, that he could drink and smoke as much as he wanted to, because he wouldn't make it much longer anyway. I think that must have been a German field hospital and then later he must have been captured, and of course, as part of the army, taken prisoner of war.
Well, he managed to stick around until a few years ago, reaching old age of over 90 years.