Dessau was a town near the boarder with Russia, and at the end of the war, it became a displaced persons camp from which people were sent "home".
Here's what Larry said:
"...in the town your dad was stationed in where he poses with the bike? They had a camp there.
A unique thing happen: (the Americans) brought in the local citizens who lived nearby and made them see what was going on in the camp, as if to ask "didn't you know this was going on?"
Whew...they must have known, but objecting would have jeopardized their own lives...
No wonder he/they never talked about the war.