Continental Air Defense Integration North

Continental Air Defense Integration North (CADIN) was a Cold War program to develop military installations in Canada for the air defense of North America using the Semi Automatic Ground Environment already being deployed in the CONUS. CADIN was a revision of the 1955 Operation Pillow for a "Fourth Phase Radar Program" to "extend the combat zone northward" with additional radars in Canada (neither country had approved the program by 1958.) After the 25 July 1958 NORAD plan included a single SAGE sector in Canada, Canada's Minister of National Defense proposed increased Canadian manning on the DEW Line, a right granted by the May 1955 US-Canada agreement. In December 1958 NORAD also approved 52 Canada radars with Frequency Diversity for FY61-63, and the initial 5 January 1959 CADIN cost sharing agreement was for 2 CIM-10 Bomarc squadrons, 7 heavy radars, 45 gap fillers, an Air Defense Direction Center, and SAGE upgrades for 25 existing radars (e.g., Beaver Lodge, Moisie, and Sydney).

Source: Wikipedia — Continental Air Defense Integration North (CC BY-SA 4.0)