It's called "Lake Groom" or "Dreamland", and it's a not-too-secret USAF/US Navy/USMC military installation for testing a truckload of new technologies, and as far as I am re-assured by my old high school buddies (at least the ones whom went on to serve; hats off to them), not a lot of that technology is stolen from extrasolar or extraterrestrial civilizations (not a lot as in none; zilch; zip; zero percentage).
The new technologies would be considered science fiction or "magick" to an ordinary perceiver like you and I, but to the military, that's what's going to save lives on the battlefield. We still have no freaketh awesinine need to use such new technologies for another few decades; when we do need them, they'll already be in our everyday environment.
Two things Area 51 produced which we now use (in fact you would be or you wouldn't be reading this): The Internet (mainly the system of communications networks we call WWW or the Internet), and the PC.
Steve Jobs (God bless his soul) did not invent the personal computer; the military did; Jobs merely pilfered the idea from Xerox, at the time a military contractor (I think they still are). Then Jobs and the Woz sold the PC revolution on the masses.
Al Gore didn't invent the Internet; he merely authorized its move from plain-jane Military/Research to Commercial App.
Both these technologies have some linear heritage at Area 51.
Both these technologies made my post possible.
Come to think of it, those Fine Men in camouflage do a lot more than protect and serve; they also beta-test the latest technology in their most dangerous, unstable states, before the tech-transfers enable us to have the final release, which is stable and not dangerous at all. I think we should all salute our troops whenever we can, pacifist, warmonger, neutral, or whatever we are.
Thanks for reading.