In the heat of battle, men (whither they are pilots or individual ground pounders or officers on ships) often, like in any witness situation, remember things that either did or did not happen. Eyewitness accounts are notoriously inaccurate. Add to that common factor the stress and excitement of battle, it is no wonder that confirmations of kills are a requirement.
That after battle assessment often is flawed too. The only way some "kills" were confirmed was after the war when the enemies records are reviewed. The Japanese often over inflated naval kills. The USS Saratoga was sunk at least 10 times throughout her career. She finally died during atomic bomb testing. Fighter pilots, who have no ego at all

have a strong feeling of competition from their peers to become either an ace or outnumber their peers in kills.
The battlefield in WWII became the most complicated in history. It is no wonder that claims were made that were later found to be not as they were remembered or recorded.
I wish I could have some of my toys in my office. It would mean that I would get even less work done, what with my computer just sitting there saying, "go ahead, go on-line, there are updates on K&C to look at, the Forum at Treefrog must have some new posts, and you can always look at my screen as I show you the great toys that are out there." Yeah, my computer talks to me, so what. No, I am not delusional, MY COMPUTER IS.

Michael