Okay, seriously now. Service Academies typically like to see a course load heavy in AP classes.
That doesn't mean that you should take AP PoliSci, though.
Do you like Chinese? If you had two years of it, you can't possibly dislike it.
You will spend the rest of your life doing things in your career path that aren't necessarily fun or rewarding.
If you like learning Chinese, take a 3rd year.
Are you thinking of taking NJROTC because you think that USAFA is going to look favorably upon it, or does the program appeal to you on it's own merits?
Again, do what you enjoy. It's an elective - in your senior year. In the overall cosmos, it matters not!