The top secret URSALA, RAQUEL, and FARRAH satellites
What happened
In 1963, the Air Force launched the first “hitchhiker” off the side of a larger satellite. This began a secretive program that lasted more than 40 years under a variety of names and designations. The satellites, about the size of a large suitcase, were festooned with antennas and spun rapidly as they orbited the Earth, sweeping their antennas over the ground and gathering radar and other signals, so-called electroni…
Summary assembled by rule from the sources below