From the Document: "By 1957, the details had been worked out and the top defense officials in each nation approved the formation of the North American Air Defense Command [NORAD], which was stood up on 12 September at Ent AFB [Air Force Base], in Colorado Springs, Colorado, home of the US Continental Air Defense Command and its subordinates, including USAF [United States Air Force] Air Defense Command. General Earl Partridge, USAF, who was both the ADC [Area Defense Counsel] and CONAD [Continental Air Defense Command] Commander, also became commander of NORAD, and the senior Canadian RCAF [Royal Canadian Air Force] official, Air Marshal Roy Slemon, who had been the key Canadian delegate in most of the cooperation talks, became deputy commander, NORAD. Nine months after operational establishment of the command, on 12 May 1958, the two nations announced they had formalized the cooperative air defense arrangements as a government-to-government bilateral defense agreement that became known as the NORAD Agreement. The NORAD Agreement and its associated terms of reference provided the political connections which would make possible the longevity of the Canadian-US aerospace defense relationship into the future years. The NORAD Agreement, with its requirement for periodic review, ensured a flexibility to adapt to a changing defense environment as would be evident by the events that would soon face the fledgling command."
North American Aerospace Defense Command: https://www.norad.mil/