How is it determined? Do you pick what you want and train for that? Or do you take some sort of test to determine what you are going to fly? And also if you don't mind me asking, what were your grades like in highschool?

Are there any certain courses in college that are required for becoming an Officer in the NAVY or USAF? And are there any that will increase my chances? What about getting my pilots license? Is it worth it to get one beforehand? Or would it be a waste of money? Any other things that would increase the liklihood of becoming a pilot in the NAVY or ...