Satellite Data System

The Satellite Data System (SDS) is a system of United States military communications satellites. At least three generations have been used: SDS-1 from 1976 to 1987; SDS-2 from 1989 to 1996; SDS-3 from 1998 to the present. It is believed that these satellites were known by the code name Quasar. The first generation was named simply 'SDS', the second generation was named 'Quasar' and the third generation each had their own designations.

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SDS
communications satellite, military satellite, 
Ashkenaz, Calvinist Republic of Ghent, Chinland, Havilah, Kingdom of Martabam-hongsawatoi, Kingdom of Wolaita, Persia, Sikh Confederacy, Tarshish, communications satellite, Dong Fang Hong 2, military satellite, Republic of Haiti, 

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USA179 SDS 3 4

Type	Subtype	Date	Description	Notes	Source
commons	image		USA179 SDS 3 4		Commons