So I was trying to get a job with the US government. It's incredible the amount of jobs available with them, in all locations. They all require that you apply for them over the Internet, from the $7 an hour jobs all the way up to over $200k a year. Interesting to note that most of the Korean posts are for Osan or Kusan. Yep, the Yongsan base must be on the way out, they don't seem to be staffing that one too much.
Anyways take a look at the USA jobs site and see what you can find. They're quite particular about requirements and as one may guess it seems like it should be all done by the book. Having done some military service or be already working for the government seems to help alot too! I think to make it work for me I'd have to head back to the States and start some trainee job.
There's always the Foreign Service. I am applying for the test and that seems like a long shot too. It's just nice to know that there are options out there.