File:Centaur-D1T stage of a Titan-3E rocket.jpg

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Centaur-D1T stage of a Titan-3E/Centaur rocket (1975)

original description: The Centaur high-energy third stage for Titan/Centaur 3 is mated with its Titan rocket in the Vehicle Integration Building in the Titan III complex at Cape Canaveral Air Force Station. Titan/Centaur 3 and Titan/Centaur 4 will launch twin Viking spacecraft to Mars in the late summer of 1975. Launch will be by KSC's Unmanned Launch Operations Directorate from Complex 41.

source: http://mediaarchive.ksc.nasa.gov/detail.cfm?mediaid=16248^{[dead link]}

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