I could tell you, but then I'd have to use a horrible old cliche from a movie about shirtless male beach volleyball that had some airplanes in it.
What I learned over many years is that the Gummint is very good at keeping certain things secret. Also, given the rather large piles of cash that have gone into such things, compared to the visible results we have seen, either something else was produced that we don't know about or somebody's got some splainin to do about where the **** that money went.