Lei, if you want a career from the military, go with the Air Force. There is the most room for advancement, there is a lot more respect, and the pay is better.
Oh, there's not a lot to my story. I wanted to go in as underwater search and rescue (not Diver) and went and took the ASVAB and set a date and everything for when I finished my degree (I've changed degrees since then). But because of hte huge lapse in time between getting shipped off and would have finished school, I changed my mind. Two years is a long time to give someone to ponder on things...they only have so many openings in the area of underwater search and rescue and so part of that was waiting for the 1.5 year opening for the schooling and position. I still to this day don't know if I regret not going or not.