Glad you've got foreign experience and language knowledge under your belt! They're a BIG help.
The people I worked with in the State Department were great - hardcore Americans with excellent educations, all very bright. And there's nothing like going into your office and seeing a big, burly Marine there buzzing you in... it fills you with all sorts of confidence 😉
That said, like I cautioned earlier, add up the price and consider the student debt you'll be getting yourself into here. If your parents are helping or you have other sources of funding, go for it. Otherwise... well... I was all gung-ho about getting an MA and heading off to save the world with State, but it would've left me strapped with a ton o' debt and a low-paying job in the DC housing market, where a decent sized home runs at least $300,000 and is far from wherever I'd be working. Given I'm a married man who'd like to have kids and a wife that can stay at home with them, making around $45,000 for starters in the DC area just doesn't cut it, even though I realize I'd spend a great deal of my career overseas. I'd like my kids to have a REAL house, not a tiny townhouse or condo.
Your priorities may vary, but just keep in mind the matter of money. Going to Georgetown is probably your best bet - its long list of distinguished alumni and faculty should prove that - but with an annual tuition of $33,000, you would leave school with over $130,000 in debt, not including any interest, and step into a job in a housing market where you can barely afford to live, let alone make student loan payments.
Just something to keep in mind....