Jeremy, there was a documentary on recently, I think it was the history channel, which reviewed all of Corso's claims. It did an excellent job of documenting that, yes, indeed, Corso really did have the military background he claimed. However, it also did an excellent job of reviewing the technologies that he claims came about due to his program, and there Corso's claims fall totally flat.
It covered fairly well the evolution of the various technologies which all clearly came about through the hard work of scientists and engineers over a very long period of time (no sudden 'wow' breakthrough moments.) And, yes, individual scientists did deny it.
You can also research the evolution of any of these technologies, starting with Wikipedia and then following sources from there. These technologies and their development are well documented and require no 'alien intervention' to explain their creation.
As far as why Corso would tell the stories, there is a much more simple explanation. We certainly know that elements of the intelligence community spread disinformation about the UFO subject. It's often hard to understand what their agenda is but, the fact of the matter is that many of our most powerful UFO myths came straight from the intelligence community.
Corso, of course, was involved in military intelligence. He is a natural conduit to spread this kind of disinformation. His story itself is ludicrous on the face of it. He just 'happens' to see alien bodies and just 'happens' years later be tasked with a project he wasn't even qualified to conduct.
He cannot provide a single, solitary, piece of witness testimony, and documentary or physical evidence to back up any aspect of his story. His claims are demonstrably false when you examine the fact that the technologies in question needed no special 'alien' intervention to come about. They came about, instead, by known human scientists and engineers as the result of decades of hard, slow, steady, work and research.
If you were the scientists responsible for creating any one of these technologies how offended would you be that this intelligence officer was making wild claims that you were not responsible for your own work? That you were so dumb you needed 'aliens' to give you a breakthrough.
Now, all that said, I personally suspect that a UFO probably did crash in Roswell. And, if it did, then the crash debris would have been analyzed by scientists and engineers. And, if we were ever to hear that true story, it would clearly be quite fascinating. What this implies then is that there may be *themes* in Corso's story which are actually true.
But, that's just how disinformation works. It works best when you mix some truth in with all of your bullshit.
Until we get some physical evidence, documentary evidence, and witness testimony (i.e. I was an engineer at this company and reverse engineered an alien device) and that testimony is corroborated, I think we should consider that the most likely hypothesis is that Corso was spreading disinformation like the good soldier that he was.
John
P.S. If I sound a little bit annoyed and ticked off, it is because I am myself an engineer and I can empathize with my colleagues at how irritating it would be to have to deal with the Corso bullshit after having devoted years of my life and intellect producing my *own* work.