The secretary of the Int'l Relations dept. met with a rep from GS and said that they're looking to hire people for really any position based entirely on personality. They're not even looking at GPA, etc, they just want to see that I have a degree from a good university and that I WANT to work for them, which I do. I just need to show up prepared to answer the toughest interview questions I'll probably ever face.
I took a quiz on their site to give myself an idea of where I'd fit in there, and it told me to apply for "Global Complaince" or "Human Capital Management" whatever those mean. Hopefully something that involves travel.
edit: many thanks for the input