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Satellite Data System
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== Mission == The primary purpose of the SDS satellites is to relay imagery from low-flying [[reconnaissance satellite]]s, notably the [[Corona (satellite)|Keyhole]] optical reconnaissance and [[Lacrosse (satellite)|Lacrosse/Onyx]] radar reconnaissance satellites to ground stations in the [[United States]].<ref name=Richelson>{{cite book |last=Richelson |first=J.T. |date=2001 |title=The Wizards of Langley. Inside the CIA's Directorate of Science and Technology |location=Boulder, Colorado |publisher=Westview Press |isbn=9780813340593}}</ref>
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