In which years did the Gemini missions, designed to carry two crew members, occur?

The Gemini missions, a crucial part of NASA's early space exploration efforts, took place between 1965 and 1966. These missions were significant because they were designed to demonstrate the ability to conduct long-duration flights, rendezvous, and docking maneuvers in space, which were essential for the success of future Apollo missions to the Moon. During the Gemini program, a total of 12 crewed flights occurred, helping to refine space travel techniques and gather valuable experience with two-man crews. This timeframe aligns perfectly with the planned launch dates and operational history of the Gemini spacecraft, confirming the correctness of the chosen answer.