“He’s been unable to tell us about anything he did there.”
Probably because it’s still classified.
My uncle of 98 years recently passed. He was an amazing guy...had five degrees in mechanical engineering, doctor and orthodontist. During WW II he worked on the Manhattan Project and for a few years after the war he worked on nuclear weapons at Los Alamos. During a visit a few years before he died, we were discussing his nuclear weapons work and I asked him about the machining tolerances on the plutonium cores. After a few moments contemplation, he said “I can’t tell you that — it’s classified information.” He was still sharp as a tack and couldn’t tell me simple things like classified tolerances 70 years later.