I recall listening to a conversation between a couple of neighbors when I was in elementary school. One neighbor had served on an American naval destroyer in the Pacific during the Second World War. The other neighbor, a German immigrant, had been in the Hitler Youth and then joined the German Navy. They talked about one event and another as if discussing a ball game. Their tone could have been taken from a documentary. I didn't ask as many questions as I should have. I was a kid and they were adults and no doubt I missed much of what was said.
Both men are dead now.
The Second World War generation is dying out. With each instance where the person's story was unrecorded, we have lost a bit of history.