Very cool, gotta take the wife there. She was a nuke in her Army days on the Pershing II systems, it's fun to watch her geek out on all things nuclear weapons related. She may be a kind hearted counselor, but deep down she's still a lover of WMDs designed to kill as many commies in one stroke as possible, and she very much would have turned the key if called upon.
Another great one to visit is the
Minuteman Missile Site outside Wall, SD that's part of the US NPS, a great side trip whenever hitting up Badlands NP or Wall Drug. If you go there, reservations are required to enter the launch bunker so plan ahead.