In recently launched book Artemis (by Andy Weir), we see that Artemis, the first city on the moon, is made of five huge interconnected spheres called "bubbles". Armstrong Bubble sits in the middle, surrounded by Aldrin, Conrad, Bean, and Shepard.
Well, everyone knows who Armstrong and Aldrin are (first and second man on the moon). Conrad is the third man to walk on moon. Bean is the fourth man to walk on moon.
But, why is Shepard so special regarding moon? I expected him to be the fifth man to walk on moon, but he isn't. Yes, I know he is the second man (and, first American) to go into space, but it doesn't make sense to put his name in Artemis if Yuri Gagarin's name isn't there.