It's an Atomic Energy Commission document, released by the Department of War. So yes, it's authentic.
Well it purports to be. I can assume it is, maybe. You say it is, because … it has an AEC letterhead? That’s not proof, that’s an observation.
The “Majestic 12” documents were forgeries, not very good ones, but they tried to be. That’s what I’m getting at, is all.