Living around one of the most heavily concentrated areas of the US in gov't, military, 3-letter alphabet agencies as well as other gov't facilities, I have definitely heard stories of some of some pretty amazing things going on with this stuff. Of course a lot of stories came out after nights of heavy drinking, but none the less it's very interesting to ponder. What amazes me is how far advanced these projects have been speculated to have gotten from what is accepted as being state of the art in the 'white world' or 'known' technology. Total game changers in the fields of propulsion, energy, computing and biological techs that remain hidden due to 'national security', but a lot of them most likely kept secret to protect the wallets of the rich.
One thing I've always wanted to do is get a hold of some 4th gen night vision goggles and just look up to see what you could catch flying around up there. (hopefully more than just bugs)
With that in mind I direct you to this page on cool military mission and unit patches that just fuel the speculation:
Some of my favorites which you can read about at the links below:
Mission Patches - Their Source And Meaning
Top 10 Most Sinister PSYOPS Mission Patches