Description : DSP F7 was part of the oldest segments of North America`s early warning system. Orbiting 23,000 mile above Earth, these satellites provided the first look at potentially hostile ballistic missiles launched from land or sea, anywhere in the world, in near-real time. For tactical missile warning, satellite data could be transmitted directly to the theater commander via the Tactical Event System. DSP sensors also detected nuclear detonations. DSP satellites were used during the Persian Gulf War to detect Iragi Scud missile launches.
Cap Canaveral post stamp and Defense Support Program launched by Titan 3 C.

USA 956 - picture enhanced ?

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Space Event :

DSP F7 (USAF OS 77) (SATELLITE) · TITAN 3C