Transtage

Hypergolic Upper Stage

The NTO/Aerozine-50 fueled Transtage Titan upper stage was developed by Martin Marietta and launched from 1954 to 1989. It flew on Titan-3A, 3C, 23C and 34D, was powered by two Aerojet AJ10-138 engines, and added the capability to launch to geostationary orbit.

Titan Rocket Family
Voted Most Patchy of all rocket families, the first ICBM based, Martin built Titan-2 vehicle launched the Gemini 1 test capsule on April 8, 1964.
Wikipedia (en)
Gunter D. Krebs, Gunther's Space Page (en)
USA
Lockheed Martin
Aerojet Rocketdyne
AJ10