sentences:  On 5 October 1960, warning lights in Cheyenne Mountain Complex indicated that the BMEWS site in Thule, Greenland was detecting a possible ICBM attack.On the five-position scale, the reports were level three, requiring Cheyenne to contact NORAD headquarters, the US Joint Chiefs of Staff, the Canadian Chiefs of Staff Committee, and Strategic Air Command (SAC).The commander on duty at that time was Colonel Robert Gould, whose first call was to NORAD's commander General Laurence Kuter, who was at that time flying and could not be contacted.