QP's, if I'm out of bounds answering on this, let me know and I'll delete it.
mfos2,
If it were me, I'd shoot for Spanish.
I would think that you could get a better grasp of Spanish over the summer than Korean in the same time period.
As for French. Think of it this way, France and some of Canada speak French. Mexico, Central America and most of South America speaks Spanish. Bigger region, more turmoil.
Also, should you not be able to get into the Army, you will have many more opportunities to use Spanish in the US than the other two languages.
Those are my completely unqualified opinions on the matter. Ultimately however, it comes down to what you want to do.
--Aric