Several sources that were there in person.
My second or third cousin is an alternate medicine cancer doctor with his own clinic in Acapulco, he treats cancer patients with stuff he worked out with another doctor that was in the room when they broke a type of cancer down, granted it doesn't work with everyone but with enough research he was 99% sure it could be done in 20 years... that was 27 years ago.
My great uncle was stationed at Nellis AFB from 43 to 59, he was on a supply run and their truck got retasked to haul some junk to Area 51, they wouldn't let the driver in the hanger but he got a quick look anyway and couldn't figure out anything he saw, he never told us what all that stuff was because they stressed that it was above top secret and him being a good soldier took that seriously.
Sure they could be fulla shite and just bragging to impress some dumb kids, but I have an instinct for when someone is slinging manure my way and this seemed legit. I could be wrong, hey if it makes you feel better don't believe me at all, that's easier.