 The 54 Titan IIs had been fielded along with a thousand Minuteman missiles from the mid-1960s through the mid-1980s.A number of HGM-25A Titan I and LGM-25C Titan II missiles have been distributed as museum displays across the United States.The most famous use of the civilian Titan II was in the NASA Gemini program of crewed space capsules in the mid-1960s.