“the grey”? I used to hear that phrase on Art Bell shows, but I don’t think you mean ET Greys. Are you at liberty to explain?
Unfortunately, I did. Hangar 18. Sorry.
https://www.google.com/books/edition/UFO_Secrets_Inside_Wright_Patterson/eZpyDwAAQBAJ?hl=en&gbpv=1&printsec=frontcover