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Here are details about a : Space commemorative cover or Space Cover.
Cosmodrom : USA
Date of Cancellation: Oct. 15, 2017
Printed: 250 units Kind of Event : Launch Launch pad : USA KSC Florida
habité?/manned?: robot Mission type : Military
ou?/where?: au sol - ground
autographe?: non - none
Description : atellite Data System (SDS) spacecraft are communication relay satellites for transmitting real-time data from US reconnaissance satellites (e.g. KH-11) in polar areas. They are also used for communications to USAF aircraft on polar routes and connect the various ground stations of the Air Force Satellite Control Network (AFSCN). The spacecraft relay the downlinked data to a ground station at Fort Belvoir, Virginia.