The 60th birthday party for the Colorado Springs-based North American Aerospace Defense Command started Thursday nearly a half-mile underground in the bowels of Cheyenne Mountain. A rare tour of the Cheyenne Mountain Operations Center came ahead of a formal ball Friday and a ceremony Saturday morning at Peterson Air Force Base that will include a full contingent of military brass and a series of demonstration flights, including a display by the Canadian Snowbirds flying team. But it started in the nuclear-proof bunker that has become the symbol of the bi-national U.S.-Canadian command, thanks to movie thrillers and science fiction hits. Read more on Colorado Springs Gazette