Beskrivning : Chalet 1 was the first launch of a heavier, more advanced electronic intelligence satellite launched from Cape Canaveral aboard a Titan 3C rocket for the US Air Force. The project was renamed Vortex when the code name Chalet appeared in the New York Times.
The Chalet / Vortex ELINT satellites were the successors to the Canyon series of near GEO ELINT/SIGINT satellites. They were focussed on communications intelligence (COMINT), but had the capability added to intercept also missile telemetry.

Kennedy Space Center post stamp and Usaf Early warn.

USA 1147 - picture enhanced ?

Sida : future · Ref: USA 1147 

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CHALET 8 (VORTEX 8, AFP-366) (SATELLITE) · TITAN 3C