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All the Air Force and Navy pilot ones are. The officer corps in both is extremely conservative and traditional. To the point that if you're not married you have difficult time rising to the mid/upper ranks.

The military generally wants soldiers to have families because it gives them more of a will to survive. I imagine NASA wants similar things for their astronauts.

I am a somewhat antisocial misanthropic weirdo: moody, inconsistent, sometimes very good, sometimes very bad.

My brother is a brick: solid family man, consistent as hell, mountain climber, athlete, scared of absolutely nothing irrational.

I'd send him into space a 1000 times before I'd send me.

Peter Watts has an interesting take on this in his book Starfish.