I just spent a few days in Cheyenne Mountain Air Force Station (CMAFS). The exercise was a good one, and the mountain is much drier than it was right after all the heavy rains and floods.
And, since it seemed like the right thing to do, I brought my copy of Footfall and re-read the bits where the hard science fiction authors went Inside as US threat team in case the space aliens turned out to be bad guys. (Non-spoiler: they invade.)
I was also reading Mission to Mars by Buzz Aldrin so it got a trip Inside, too.