Go into a Military Career Center when you have some time. They usually house all four branches with the Coast guard thrown in at some. Visit each branch and talk with a recruiter at each. Tell them about what you want out of life and they will tell you how they can help you reach that goal. I assure you that is how they will guide the conversation anyway, each service in it's own special way.
I highly recommend visiting at the beginning of a month. When the end of a month draws near, recruiters are desperate to make "mission." they use that term to avoid using the word quota. They have a quota! Near the end of the month some less than honest recruiters will say anything to get your John Hancock to avoid the butt chewing, or worse if they failed to make mission before, from their command.
Don't let that scare you. The majority of recruiters I talk with are honest men. However, if they do tell you something that sounds too good to be true, run it by me and I'll give you the real deal.