[@LordZell]Area 51 is outdated terminology, and was really only used by the CIA to refer to the base. Proper names for the base are Homey Airport, or Groom Lake/Groom Lake Air Force Base. It's also primarily used for testing Aircraft and Air-based Weapons, so your utilization of the technology housed there would be limited to that field of conflict for the most part, and that's without mentioning that many of the projects there are likely prototypes barely ready for field testing. It's also less of a 'base', and more a defended airfield, with it primarily being a remote detachment for Edwards Air Force Base in Southern California, and considered by the government to be an extension of Nellis Air Force Base. It's past experiments include the Lockheed U-2, A-12, D-21, Have Blue, and F-117 Nighthawk, and testing Soviet and Chinese Aircraft captured during various operations. Official CIA involvment lasted until 1979, and since then it has been under jurisdiction of the military brass at Edwards.

So while having the base under your control would aid in air combat, without also controlling the nearby Nellis AFB, and Edwards AFB, you'd be rather limited, and it CERTAINLY wouldn't give you a significant edge in most forms of combat.