EntityQ6818588· pop 5· linked from 98 articlesMercurySign in to saveseries of three United States spy satellitesConnectionsgeostationary orbitEntityreconnaissance satelliteEntitysignals intelligenceEntityOrionEntitylist of NRO launchesEntityUnited StatesCountryphotographyEntityUTCEntityespionageEntityUnited States Air ForceEntityEdward Mills PurcellEntitylow Earth orbitEntityshort circuitEntityProject MercuryEntityDijkstra's algorithmEntityCape Canaveral Space Force StationEntitygeosynchronous orbitEntityclassified informationEntityInternational DesignatorEntityEdwin H. LandEntityCategoriesMilitary equipment introduced in the 1990sReconnaissance satellites of the United StatesSignals intelligence satellites