 The CF-100 would have a long gestation period before finally entering RCAF service in 1952, initially with the Mk 2 and Mk 3 variants.The CF-100 Canuck operated under NORAD to protect airspace from Soviet threats such as nuclear-armed bombers during all weather and day/night conditions.Although not designed for speeds over Mach 0.85, it was taken supersonic during a dive by test pilot Janusz Żurakowski in December 1952.