 The space launch vehicle versions contributed the majority of the 368 Titan launches, including all the Project Gemini crewed flights of the mid-1960s.Titan vehicles were also used to lift US military payloads as well as civilian agency intelligence-gathering satellites and to send highly successful interplanetary scientific probes throughout the Solar System.The HGM-25A Titan I, built by the Martin Company, was the first version of the Titan family of rockets.