<P> The second rearrangement occurred when Shepard developed Ménière's disease, an inner ear problem . Grissom was then moved to command Gemini 3 . Slayton felt that Young was a better personality match with Grissom and switched Stafford and Young . Finally, Slayton tapped Cooper to command the long - duration Gemini 5 . Again for reasons of compatibility, he moved Conrad from backup commander of Gemini 4 to pilot of Gemini 5, and Borman to backup command of Gemini 4 . Finally he assigned Armstrong and Elliot See to be the backup crew for Gemini 5 . The third rearrangement of crew assignment occurred when Slayton felt that See wasn't up to the physical demands of EVA on Gemini 8 . He reassigned See to be the prime commander of Gemini 9 and put Scott as pilot of Gemini 8 and Charles Bassett as the pilot of Gemini 9 . </P> <P> The fourth and final rearrangement of the Gemini crew assignment occurred after the deaths of See and Bassett when their trainer jet crashed, coincidentally into a McDonnell building which held their Gemini 9 capsule in St. Louis . The backup crew of Stafford and Cernan was then moved up to the new prime crew of the re-designated Gemini 9A . Lovell and Aldrin were moved from being the backup crew of Gemini 10 to be the backup crew of Gemini 9 . This cleared the way through the crew rotation for Lovell and Aldrin to become the prime crew of Gemini 12 . </P> <P> Along with the deaths of Grissom, White, and Roger Chaffee in the fire of Apollo 1, this final arrangement helped determine the makeup of the first seven Apollo crews, and who would be in position for a chance to be the first to walk on the Moon . </P> <P> In 1964 and 1965 two Gemini missions were flown without crews to test out systems and the heat shield . These were followed by ten flights with crews in 1965 and 1966 . All were launched by Titan II launch vehicles . Some highlights from the Gemini program: </P>

What was the name of the rocket that was used to lift the gemini spacecraft into orbit