Beskrivning : 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. When the first eight missions failed to return the capsule successfully, two more Discoverers without imaging payload (Discoverer 12, 13) were launched. After that, KH-1 9 was finally successful resulting in the only return of film during the KH-1 series.
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