Should I take another language in college, if so what one?

I'm registering for classes soon. I'm a freshman. I am majoring in psychology, and I might minor in political science or sociology. Or minor in a language. I already am somewhat fluent in Spanish, but I want to learn another language. I want to work for the government such as FBI or CIA, or some other place like that. I am also joining Air Force after college. What language should I take according to my plans, Chinese, Japanese, French or German?