Spacemen refers to astronaut.
They have to do with going to space in a spacecraft, that's why they are referred to as spacemen. Their work takes them to space, and they train so hard to be a spaceman.
Maybe it is my location, but it's been a while I have seen a young man aspiring to be an astronaut. They all seem to be taken by other occupation. I don't know if they are scared or they just don't see it as something they can do.
The work of a spaceman is essential and it has to be something done voluntary because of the training involved. To be a spaceman, you have to be very good with your work.
I would love to go to space sometime, but not as an astronaut. I guess as a tourist to space, lol.
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