On the surface, there are a couple of things you can take, and which
are basically the sole reason for bothering with it. The vertibird
plans, an electrical engine and a K-9 motivator (looks just like the
engine). Be sure not to miss the plans.

Now what may not be obvious is that you don't have to clear the
surface in one go. Get up there, and stay relatively close to an
elevator. Shoot as much as you feel safe, then use the circular
elevators to go down and heal, if you or any of your group starts
taking too much damage. Also, you can skip some of the guards and
turrets, if you can get the plans and engines without triggering them.
E.g., the front gate guards probably won't come after you if you stay
around the back area.

If you want to, you can use the K-9 motivator to activate the
cyber-dog downstairs and take him with you. He's just the same crappy
cyber-dog as the one from the NCR scientist, only this one can also
talk. Other than that, it's still just as crappy in combat, and you
still can't use it to carry excess weight.

Fourth way is to do it "on the sly", if you've talked to the
Brotherhood of Steel guard in San Francisco and he's told you that
Navarro is accepting recruits. Again, don't leave your companions in
San Francisco, if you choose this approach. Just ask if this is
Navarro, tell the gas station dude that you're a recruit and you hired
an escort, find the password. Go north. Tell your companions to wait
you there, talk to the guard in front of the gate, say the pasword.
Do NOT talk to the drill sergeant, as you're told at the gate, or
you'll get assigned to a post (not necessarily bad), and the sergeat
will start going around in circles, checking all guards, including you
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