Beskrivning : The KH-1 (Keyhole-1) was the first attempt in the Corona-program to build an optical reconnaissance satellite. These satellites were all launched under the name Discoverer.
After testing the basic vehicle without camera and return capsule on Discoverer 1 and only with SRV on Discoverer 2 and 3, ten KH-1 satellites were launched, but only one resulted in a successful return of film. Three missions failed to orbit.