In 1956 its aircraft were removed, too old and slow to catch and shoot down the newest Soviet bombers, and the auxiliary wing became an air defence radar unit that provided surveillance, early warning, and Ground Controlled Interception guidance to fighters in the London area. None of these three 22 Wings had any direct or indirect connection with North Bay. The fourth, prior 22 Wing evolved out of a unit called the "Radar Control Wing". The Radar Control Wing was created by the air force in 1987 to run day-to-day air defence operations in the Underground Complex for the Canadian NORAD Region. When an extraordinary event occurred or was about to occur, such as the approach to Canada of Soviet bombers, the Radar Control Wing alerted the Canadian NORAD Region, and the region's general and selected members of his staff would man a command post on the second floor of the Underground Complex. The Radar Control Wing and command post would then coordinate their efforts to handle the situation. For example, regarding Soviet bombers, while the Radar Control Wing saw to such activities as intercepting the aircraft and coordinating with civilian air traffic control in the area of the interception to avoid running into airliners, the command post would advise and consult with NORAD Headquarters in Colorado Springs, arrange an AWACS aircraft to assist, if deemed useful, and talk with the adjacent American NORAD region if it looked like the intercepted aircraft would enter their area, too. When the Radar Control Wing was created, it was given command of the Sector Operations Control Centre East, which watched the eastern half of Canada from the Atlantic Ocean to the Manitoba border, and the Sector Operations Control Centre West, which oversaw Canadian skies from Manitoba to the Pacific Ocean. In June 1989, the wing was renamed "22 Radar Control Wing". Simultaneously, the eastern control centre was renamed 21 Aerospace Control and Warning Squadron and the western centre became 51 Aerospace Control & Warning Squadron. Although it resided on CFB North Bay, and the base provided such things as pay, clothing and medical services, 22 Radar Control Wing was an entirely separate entity from the base with its own commander and staff of personnel. In 1992, CFB North Bay and 22 Radar Control Wing were amalgamated under a single commander and command staff, but the base was still officially CFB North Bay. The wing and the base remained as separate organizations until united into 22 Wing/CFB North Bay in April 1993. As well as divesting the base of the airfield following 414 Squadron's departure in 1992, the Canadian government embarked on the wholesale demolition of CFB North Bay's non-airfield buildings and facilities, and dramatically slashed the numbers of civilian and military base personnel.