That's why I'd like Jock to explain exactly how it was done. It would be intriguing, I think, to compare it to the experiences of others who have had to get approval from the military for various purposes.
But in any case, as others have pointed out, it's totally ridiculous that, at the time when he should have been on the Moon, Armstrong was casually going out for golf games with visiting Brits, signing in under his own name. At least most conspiracy theorists credit the hypothetical conspirators with some intelligence. But "keep the fake astronauts holed up somewhere no one will see them" seems to be a pretty obvious point of any successful conspiracy.