RC-121 Warning Star USAFLockheed RC 121 Warning Star airplane model. The Warning Star entered service in 1955, with the final variants being retired from the US Air Force Reserve in 1978. The Warning Star pioneered the concept of Airborne Early Warning and Control, with units being used for fleet coverage, airborne extension of the Distant Early Warning (DEW) Line, support of the Apollo Space Program and other force coordination tasks. Throughout its life the Lockheed
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