One of the main counter points to 9/11 government conspiracy, is that a operation of that scale just couldn't be keept a secret, since to many people would be involved (and the government is all together useless). Yet here we are with a freaking flying saucer that the government did make, and apparently keept secret for over 50 years! I don't know how many people ware involved, but I'd imagine that a lot. So ... I guess they can keep big secrets?