I'm assuming you don't have a college degree, in which case sign up for the GI bill. Just do it, and go to school when your enlistment is up (or you retire).
If you do have a college degree, don't enlist. Go through Officer Candidate School and get a commission.
Good choice in the Navy, BTW. My husband is a captain (colonel in Marines or Army) in the Navy Reserve. I would direct your questions to him, but he, uh, doesn't know I visit this site.
You mentioned medical on your list. That could be a really good option with great post-service opportunities.
Yeah, thanks.
Right now, I'm leaning toward cryptologic tech, intelligence, or IT.
What does your husband do, if I may ask?
I can't really say because it's a pretty specific position, and sharing would risk my anonymity. When he started almost 25 years ago, he was a submarine officer. But you already said you weren't interested in nuclear power, so I didn't mention that above.