When I was considering, the tattoo policy was that none could be visible in class A's. But that was before the wars.
My neighbor was an armorer and he said it was just like having a normal job. Eight hours, go home. That sort of thing. And once you complete training, the pay is considerably higher than your rank's pay grade due to the special skill set--you get paid on the GS scale rather than the standard pay grade. He said.