The PineTree Line | The Brian Mulroney Institute of Government

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The PineTree Line

In 1951, Canada and the United States feared an attack on North America by Soviet bombers, so as a result, the two nations agreed to build the Pinetree Line of radar detection sites that would be located across the northern US and southern Canada.
Plans to build the PineTree Line began with the Permanent Joint Board of Defence in 1946, but due to high costs, the plan would not begin until 1951, following the increased threat of Soviet bombing with the successful test of the atomic bomb in the USSR.
The Pinetree Radar Line was the first coordinated system for early detection of a Soviet attack and later became part of the North American Air Defence (NORAD) where it would be replaced by more up-to-date detection technology.

Citation

Forsyth, Bruce. "The Pinetree Line." Canadian Military History. Accessed June 16, 2022. https://militarybruce.com/abandoned-canadian-military-bases/pinetree-line/