My visit to Cheyenne Mountain and NORAD’s Headquarters was a particularly fascinating part of my education.  NORAD was a joint U.S.-Canadian command that had begun in the 1950s with its backbone being the Distant Early Warning (DEW) line of radars across the Canadian tundra. By 1969, when I received the unclassified portion of my NORAD Mission Briefing, it was already tracking space junk, and reorienting its mission from