tl;dr: Recently declassified documents reveal details about a 40-year NRO program of small "hitchhiker" ELINT satellites (Program 989/Mission 7300), deployed off larger HEXAGON reconnaissance satellites and later launched independently, with names like URSALA, RAQUEL, FARRAH, GLORIA, and CARRIE. These spin-stabilized satellites collected radar and signals intelligence from low Earth orbit, evolving from strategic collection for national-level customers to directly supplying tactical military forces via mobile ground vans—pioneering the TENCAP (Tactical Exploitation of National Capabilities) concept. Some FARRAH satellites launched in the late 1980s and early 1990s may still be operational in orbit today.