USAFA for Cyber Defense Officer?

I'm a sophomore in high school and my dream is to become a USAF Cyber Defense Officer. Is anyone working in this or currently in the computer and network security major that can tell me more about it? Any advice for preparing for this?

Also, I am taking AP Computer Science as my elective this year, but not sure what to take next. Would any classes/languages be more beneficial? I've already done VB, C#, and a little HTML & Python.

Thanks!