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| | Martin Marietta Titan Launch Vehicles (Site not responding. Last check: 2007-10-21) |
 | | The Titan III-A was quickly replaced however by the Titan III-B which usually had an Agena D as the third stage; this combination launched numerous Air Force satellites during the 1960s and 1970s. |
 | | The biggest change to the Titan series, however, was the addition of two large solid rockets to the main vehicle to increase the available thrust at liftoff from 463,000 to 2,360,000 pounds. |
 | | The Titan series of launch vehicles have usually used one of four main upper stages -- the Agena, the Transtage, the Boeing Inertial Upper Stage, of the Centaur -- depending on the payload and the mission. |
| www.wpafb.af.mil /museum/space_flight/sf22.htm (579 words) |
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