It could go either way! There's a very skeletal skeleton crew up there right now, who are mostly just making sure the place has enough oxygen to sustain human life, and very essential, baseline things like that. So an NPC could be one of those characters, or someone who is picked to go along with the Transports. In the latter case, they would be picked for their skill, being generally recognized as the best in their area, and so the one picked to live while everyone else stays behind to, well, be nuked.
And RE the moonbase, not yet! Currently the history books say things like, a space-enthusiastic America built it in hopes of venturing out further into space, but the program used too much money and generated none, and so was cut short due to lack of funding. The base was abandoned in the 2200s after only a few years of use, and has been sitting empty ever since, and that's about all anyone could tell you about it. We'll be learning more about it as the plot goes, and releasing layout information before it kicks off.
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And RE the moonbase, not yet! Currently the history books say things like, a space-enthusiastic America built it in hopes of venturing out further into space, but the program used too much money and generated none, and so was cut short due to lack of funding. The base was abandoned in the 2200s after only a few years of use, and has been sitting empty ever since, and that's about all anyone could tell you about it. We'll be learning more about it as the plot goes, and releasing layout information before it kicks off.