English, Turkish, and a bit of French.
I'm in the US, if that makes a difference. I'd hope not, but I've met way too many people who can barely speak English correctly, let alone any other language.
Jack the Potato said:
Or just sign up to be an interpreter, then the military will PAY YOU just to learn a language. And yes, Spanish is available. BUT DON'T PICK FARSI. I can't stress enough how much it sucks to learn.
It must suck to learn, but you'd never have to worry about job security - we're going to be needing Farsi interpreters for a long time. Honestly, either that, Arabic, or Mandarin are probably your best bets if you're going to learn a language and you're seeking a career. Only problem is, they're all really hard...and Mandarin is supposed to be the hardest language on the planet.