Someone speculated that he was just trying to impress Letterman during the interview and got carried away.
Impress Letterman by falsifying an easily-proved/disproved event... Again... the intelligence factor kicks in.
Sort of reminds me of that guy in the Mall wearing an Army uniform, and a real Vet calls him out on it, from a few months back.
Vets who have been in harm’s way should be outraged and innundate this clown at every opportunity.