Fighter pilots check a lot of boxes in what NASA wants to see in an astronaut. Its also worth noting that most of these guys are not “just” fighter pilots. They also usually have STEM degrees too.
The “demographic” of astronauts will change as the volume of people to space increases and the missions changes. Less flight positions and more technical specialists or tourists. Still, I assume there will be a lot of former fighter pilots stepping foot on Mars for the first time.
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