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USAF Museum
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Lockheed EC-121D
Constellation
The EC-121 was a radar-picket version of the C-121.
It entered service with the Air Defense Command in 1953, flying
patrols off the U.S. coasts as an aerial extension of the Distant
Early Warning (DEW) Line. The Air Force ordered 82 EC-121s between
1951 and 1955.
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