stage received it or if it had already broken up by that point. The first Titan IIIC flew on June 18, 1965, and was the most powerful launcher used by the Air Force until it was replaced by the Titan 34D in 1982. The last IIIC was launched in March 1982. Design The Titan IIIC weighed about at liftoff and consisted of a two-stage Titan core and upper stage called the Titan Transtage, both burning hypergolic liquid fuel, and two large UA1205 solid rocket motors. The solid motors were ignited on the ground and were designated "stage 0". Each motor composed of five segments and was in diameter, long, and weighed nearly . They produced a combined thrust at sea level and burned for approximately 115 seconds. Solid motor jettison occurred at approximately 116 seconds. The first core stage ignited about 5 seconds before SRM jettison. Designated the Titan 3A-1, this stage was powered by a twin nozzle Aerojet LR-87-AJ9 engine that burned about of Aerozine 50 and nitrogen tetroxide (NTO) and produced thrust over 147 seconds. The Aerozine 50 and NTO were stored in structurally independent tanks to minimize the hazard of the two mixing if a leak should have developed in either tank. The second core stage, the Titan 3A-2, contained about of propellant and was powered by a single Aerojet LR-91-AJ9, which produced for 145 seconds. The upper stage, the Titan Transtage, also burned Aerozine 50 and NTO. Its two Aerojet AJ-10-138 engines were restartable, allowing flexible orbital operations including orbital trimming, geostationary transfer and insertion, and delivery of multiple payloads to different orbits. This required complex guidance and instrumentation. Transtage contained about of propellant and its engines delivered . General characteristics Primary Function: Space booster Builder: Martin Marietta Power Plant: Stage 0 consists of two solid rocket motors. Stage 1 uses two LR87 liquid propellant engines. Stage 2 uses one LR91 liquid propellant engine. Stage 3 uses two Aerojet AJ-10-138 liquid propellant engines. Length: 42 m Stage 0: 25.91 m Stage 1: 22.28 m Stage 2: 7.9 m Stage 3: 4.57 m Diameter: Stage 0: 3.05 m Stage 1: 3.05 m Stage 2: 3.05 m Stage 3: 3.05 m Mass: Stage 0: Empty 33,798 kg/ea; Full 226,233 kg/ea Stage 1: Empty 5,443 kg; Full 116,573 kg Stage 2: Empty 2,653 kg; Full 29,188 kg Stage 3: Empty 1,950 kg; Full 12,247 kg Lift capability: Up to