My father saw Dachau a few weeks after it was liberated. He spent that winter near Munich.
He never talks about it, but his service in Europe during WWII forever changed him. He is 87.
I also had a prof in college that became a mentor. He taught poetry and classical lit. He joined the Marines when he was 17 and “got” to go fight the Japanese in WWII. He talked about it to me. Quite a bit. He NEEDED that talking. He NEEDED me to understand. So did I.
Thank your father for his service, from ALL of my family.