>>3663375 (lb)
Area 51 is NNSA now, which is DOE. More interesting is the S4 and S5 sites that are just south of Airspace 51. These surface installations are one thing for Aircraft testing and radar cross section testing (stealth) hence the dry lake beds. 60's-70's technology really. Like you said, the info that is out is spotty and plentiful. I'm sure most advanced research is underground as it has been for decades. Look in the Catalog for threads of this nature Anon.