Hey another Corpsman! I went to Corps School in `97. I was on the USS LaSalle (AGF-3) from 97-99 and in Millington, TN from 99-01 when I got out.
From what I undersand is that California is the only place that lets you sit for the LVN exam. The college I'm going to for ADN, and they let me out of A&P1, but I've had to take all the other required courses. A friend of mine took all his pre-req's while still in since the TA is so good. Good luck!