It should come as no surprise that catastrophic events with huge losses of life such as war, would have a paranormal component to them. While everyone talks about the battles and key victories of the great wars, no one really goes into detail about the spooky shit that went on (because it was classified) or it was dismissed as rumours and fringe science. Except, there’s truth to a lot of the ghost stories.
Just because the official records to confirm, doesn’t mean the memories and experiences of the veterans don’t matter. They were there and they saw a lot of unnatural things happen; both by humanity and the ‘other side.’