For the Mars mission, three years in a tin can, the consensus is they will need different qualities: Indoorsey types who enjoy reading and knitting and other such quiet solitary pastimes.
Considering the number of AIBU and C-19 discussions about DHs sitting around the house, doing nothing, I'm sure they could find the right men for the job
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In all seriousness, there will be plenty for them to do on the way, long term microgravity experiments and being far away from Earth's radio noise.
Gronky, the fact most satellites in orbit are there for communication purposes and not physical devastation is proof your conception of space as an inherent battlefield is incorrect.
That's the product, not the development that led there, I didn't say it was an inherent battlefield, I said that the development of rockets as weapons of war got us there quickly. Look at the primary purpose of the rocket which launched Sputnik 1. As another example, there's more civilian reactors than plutonium producing reactors in the world but almost every reactor design employed on a commercial scale can trace its roots back to the plutonium piles of the 40s and 50s. It's possible that power-generating reactors would have been developed eventually but the intense drive to build a weapon of unimaginable power got us there in 1000 days.
The reason we don't have orbital weapons platforms is due to treaties signed because, even at the height of the Cold War, it was recognised that placing nuclear weapons in orbit led to unacceptable risk (difficulty identifying the aggressor and short reaction times causing itchy trigger fingers).