NASA space psychology subjects ending 8 months of isolation

[Ilsa]

9. I knew someone who would gladly go.

Science degree, pilot, extremely intelligent, easy-going personality. He would have been a wonderful choice, but he didn't have a specialty and advanced degree beyond piloting. He was younger then, and the only thing that kept him from volunteering (if he had had the other qualifications) was that he didn't want to miss his kids growing up.

I have no doubt that NASA can find volunteers willing to make the sacrifice. But yes, personality is important for a mission like this. You can't have six alphas, they have to be willing to work together to solve problems, cool under extreme pressure, flexible, etc.