system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: What are the duties of military personnel stationed in peaceful countries.

For example American military personnel stationed in South Korea or Japan. What are their responsibilities and duties.
gpt
There are lots of things to do around the base like maintaining equipment and routine training. There are hospitals to run, jeeps to clean, and paperwork to fill out.

However their main duties, i.e. the reason they are there is first place, is to be ready in case something happens.  Something may happen that at least a few of them need to be mobilized at an hours notice. Most of the time it is to help with some sort of disaster but in theory they could be the front line for a war with North Korea.  

That might seem very unlikely but the fact that they are there and that they are ready is a large part of the reason that such a war is unlikely.