The Apollo mission for each of these astronauts, (or astroNOTS as Ralph René calls them), was their FIRST, and ONLY, experience of space travel, apart from Shepard's 15 minute sub orbital space hop, which was limited experience of zero gravity. Anders, Bean, Haise, Swigert, Mitchell, Shepard, Irwin, Duke, Schmitt, Roosa, Worden, Mattingly and Evans. The last three of this list allegedly performed deep space walks, (125,000 miles from Earth), on the return mission.
Would someone who has had no space experience whatsoever be assigned to such a complex, and dangerous mission in deep space, and why faff around doing space walks outside the capsule exposing one's self to highly dangerous cosmic radiation, not to mention the possibility of something going wrong, when getting back to planet Earth would be the top priority? Shouldn't they have chosen some one who had some sort of experience in low Earth orbit before such a challenging and complex mission? Not really, because they knew they were not going to the Moon.