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![]() Date: 2006-02-01 18:34:42Royal Canadian Air Force Military United States Air Force Canada Distant Early Warning Line Permanent Joint Board on Defense North American Aerospace Defense Command Mid-Canada Line Pinetree Line Canada–United States relations Radar networks Aerospace Defense Command | Source URL: pubs.aina.ucalgary.caDownload Document from Source WebsiteFile Size: 1,54 MBShare Document on Facebook |