Descripción : The first satellite was successfully launched in August 1968, but was lost soon after reaching its station due to erroneous commands sent by ground control. The next two satellites became operational in orbit, but suffered both from service outages. The fourth was lost in a launch failure. The final three satellites eventually performed better and produced valuable intelligence data.
The satellites were primary built to intercept soviet communications transmissions, especially line-of-sight microwave links, but were also able to tap into very high frequency (VHF) communications.
Kennedy Space center post stamp and spy satellite Midas9.

USA 543 - picture enhanced ?

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CANYON 4 (SATELLITE) · ATLAS SLV3A · FAILURE