Gemini 12 was a 1966 crewed spaceflight in NASA's Project Gemini. It was the 10th and final crewed Gemini flight, the 18th crewed American spaceflight, and the 26th spaceflight of all time, including X-15 flights over 100 kilometers. From Wikipedia
His crisis management on Apollo 13 shaped his legacy in lunar exploration following trailblazing Gemini and Apollo flights.