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As ambitious Cold War-era projects go, the picket line of air defense radars above the Arctic Circle, stretching from Alaska to Greenland, ranks up there with the Polaris missile and the Lockheed SR-71.
Credit: Raytheon via Canadian Department of National Defense
Unlike the latter two examples, the radars of the U.S.-Canadian North Warning System (NWS) are still functioning, although their days seem numbered. The original 20-year service life of the NWS expires in 2025, yet the North American Aerospace Defense Command (NORAD) expects to continue operating the radars through 2035.

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