Aircraft Control and Warning Squadron (AC&W)
The 42 Aircraft Control and Warning Squadron was one that was involved in radar. It began work in June of 1955, though it was outside of the air defence system. The role of this group was controlling CF 100 interceptors and Lancaster bombers featuring the CF-100 radar, via radar.
They began a school in 1956, for fighter controllers. The main task of the squadron was early detection and in June of 1983 it became a member of the Region Operation Control Centre (ROCC), which replaced SAGE. The Pinetree Line was mostly shut down by 1985 but this squadron continued to work there with radar anyway, giving ROCC the data.