One of the very first things that a new NASA astronaut learns is that there is no “I” in team. As part of their nearly two years of training before becoming eligible for flight assignments, prospective astronauts are told not to use the space agency, or their spaceflight status, for self-promotion.

The mission comes first, and while astronauts may be the most visible part of the NASA team, they are there to represent the agency and not themselves. Some recent astronauts who used their spaceflights to successfully boost their public profiles—such a Chris Hadfield and Scott Kelly—did so knowing they never intended to fly again. That’s not to say that Hadfield and Kelly were not great astronauts, nor team players. It’s just that astronauts who want to earn future flight assignments don’t call attention to themselves.