The shut-down of Cheyenne Mountain isn't new. I remember posting something about the closure a few months back on a thread about what was down there.
While there might be a Deep, Dark Secret behind the closure, I can also think of several reasons that aren't conspiratorial at all.
One is age...it's not a new facility, and it probably shows it. Even if you can update the computers and other hardware (and I'm pretty sure that
they have

), the complex itself is going to start showing its age sooner or later...upkeep costs will skyrocket (and they aren't low to start
with), and space will be running low...we wouldn't want to accidentally launch a nuclear strike because somebody put their coffee mug on The Button,
would we?
There's also the vulnerability problem. While Cheyenne Mountain was very well protected against the nuclear weapons of fifty years ago, increasing
accuracy means that it's now vulnerable to a multi-warhead shot...as is just about anything else that you care to take such a shot at. If you're
going to be vulnerable anyway, why *not* go to a 'less secure' facility that's more flexible, more modern, and less expensive. I'm not saying that
they should set up shop on a card table in the local park, but being a mile or so underground might not be worth the effort any more.
Or, of course, there could be something going on...