Really? Like I said, how do you know?
1) Common Sense
2) Working with the Feds
3) Common Sense
4) Having worked in a university research lab
5) Common Sense
6) Having worked in industry tracking evolving technologies
7) Common Sense
Did I mention that it would be a real leap of faith and breach of
common sense to think that somehow the Feds have solved all of the multiple problems with bringing a technology to fruition far enough ahead of the many commercial and university research programs studying the same issues with many more people all around the world, when the sum total of those labs has yet to solve even the minimum set of issues required.
The DST's existence and function an organization, as well as the DI or DO, is not secret at all(hence the website). But unless you can at least describe the wall tile design in the john at NHB, its a safe bet you also have no idea of what lye behind their doors.
I will tell you with certainty that I have little idea what is behind the walls, but I will tell you with even greater certainty that with little study you can know what is NOT behind the walls.
They don't have cold fusion, they don't have a universal code-beaker, and they DON'T have a working practical quantum computer. (Nor the remains of a crashed extra-terrestrial UFO)