EntityQ4782628· pop 5· linked from 103 articlesAquacadeSign in to savemodel of American signals intelligence satelliteConnectionssignals intelligenceEntitygeostationary orbitEntitygeosynchronous orbitEntityreconnaissance satelliteEntityOrionEntityUnited StatesCountryMiddle EastConceptphotographyEntityInternational Standard Book NumberEntityCentral Intelligence AgencyEntityespionageEntityUnited States Air ForceEntityNational Security AgencyEntityEdward Mills PurcellEntitylow Earth orbitEntityDijkstra's algorithmEntityCape Canaveral Space Force StationEntityInternational DesignatorEntityEdwin H. LandEntitysynthetic aperture radarEntityCategories1973 in spaceflightCold WarMilitary equipment introduced in the 1970sNational Reconnaissance Office satellitesSignals intelligence satellites