Cheyenne, Wyoming —  Flying in over the Wyoming prairie aboard the Air Force's new Grey Wolf helicopter, the commanders of U.S. Strategic Command and Air Force Global Strike Command are taking us to a place that was once so highly secure that trespassers could be shot on sight — a Minuteman III Intercontinental Ballistic Missile, or ICBM, silo.  Hundreds of these active nuclear silos dot the landscape from Colorado up to the Canadian border. "There are always approximately 400 (ICBMs) ready to