My recommendation since you sound pretty gung-ho and you want to fight:
Join the Marines. Do your four years and kick some ass. After that, leave active duty and go to college and let the government pay for it. They'll even pay you (I believe as an E5) while you're there so it simply doesn't get any better than that. While you're there join the nearest reserve unit so you can still play with tanks and guns a few weeks out of the year.
After you get your degree you can go anywhere you want with both that and the military background. You can go back in to any branch and become an officer and get paid a lot better. You can go federal LE and pull in six figures after a couple years on the job. You can even go local police if that's your thing but you with so much experience and training you will probably be captain and eventually chief material.
Last edited by benton0311; 07-14-2010 at 02:07 AM.