You NEED to fight it, regardless of what the recruiter told you. You do not want this on your record if you can avoid it. When you go to enlist in a 6 months, the rules may have changed and you are no longer eligible. In case you haven't noticed, the Justice Department is pushing for more punishment for things. That could easily find it's way into other departments' attitudes towards minor crimes.
You should also learn to mind your temper and attitude. That kind of thing isn't going to go over very well in the military.

