There is a romour that at the lower excavated levels of area 51,most of the world's greatest minds live and perform genetic engineering experiments purely for military purposes,they work for an organization called majestic 5
Yes, Area 51 indeed does exist. It is a incredibly secure military facility that has NEVER been open to the public before, Some people say they even have UFOs there...
However, it probably isn't the main base of operations for weapons testing. All of the stuff the military shows to the public has been in the can for 10 years - the 'state of the art' weaponry that they reveal is 'state of 10 years ago art.'
I heard it from my dad, who heard it from two separate high-up researchers in secret government weapons crap.