What tickles me is about these people (Hoagland, Lazar et al)claiming NASA are hiding some big secret is that no one tries to silence them. I mean, come on, if you where privy to a great, big, fat, hairy secret of that importance you'd have the spooks crawling all over you constantly. Any attempt to leave the project would be quoshed. Even if you esaped and went public, they'd have you removed so fast no one would realise you even tried anything.
Any way, why NASA? I thought they where ostensibly a public body but historically reporting to Government. A throw back to Cold War days. If any one has secret tech it would be the secret services and DARPA. And at that it's mundane, better radar or bigger/better satellite surveillance. A friend of mine was working on state of the art 3D modelling of the battle field some years ago. That was 'secret'.