Apollo Command/Service Module
During the Apollo 13 crisis, Mitchell was a part of the Apollo 13 Mission Operations Team and as such was awarded the Presidential Medal of Freedom by President Richard M. Nixon in 1970. He worked in an Apollo simulator to help bring the crew back. One issue he worked on was how to "fly" (meaning control the attitude of) the Lunar Module with an inert Apollo Command/Service Module attached to it. (Usually, it was the other way around, but the Service Module was damaged during that mission.)