First things first

Dream all you want. You know a Entry level GS-17 position in Japan.

Now, come back to earth.

The problem with government jobs. Or government contracting jobs is everyone wants one. Plus on top of the people already in Federal Service who want a step up or transfer.

So to get one. This is what you need

A friend you know extremely well who can vouch for you. Or hire you themselves

Next would be getting a Dual status position. It’s a job where you have to be reservist in the same unit you are a reservists.

Next would be put in for lower paying jobs in shitty areas. For example there maybe 1000 applicants for a job in Florida go option