That’s a cool story and I don’t necessarily discount anything, but the “Majestic 12” documents are proven forgeries, laughably bad, in fact.
There are a lot of Majestic 12 documents—and while some may be forgeries some look rather solid.
The crash retrieval manual is one of the solid ones imho.
What I refer to as the “Crash Retrieval Manual” is this document:
https://cdn.preterhuman.net/texts/wars_and_weapons/Majestic_12-UFO_Official_Manual.pdf