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Here are details about a : Space commemorative cover or Space Cover.
Cosmodrom : USA
Date of Cancellation: Jun 12, 1978 Kind of Event : Launch Launch pad : USA Edwards
habité?/manned?: robot Mission type : Military
ou?/where?: au sol - ground
autographe?: non - none
Description : 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.