I was an army medic rather than an navy corpsman but I challenged the LVN boards in California and passed first time no problem.
For those who are interested in becoming an RN here is the way I became an RN and you former medics and corpsmen can do it too.
Challenge the LVN boards in Ca and after you have your LVN license come here to WIsconsin and enter one of our technical colleges. The Wi Technical college s (16 of them) offer LPN to RN in one year or less. I had zero college credit to my name, just my army training and my LPN lcense and I became an RN with an associates degree in nursing and a licensed RN in only two semesters. I CLEPT lot's of classes (with zero study time) and passed. I had a 16 credit course load for those two semesters and had no trouble.
I started school in Aug 2005 and graduated in May of 2006 with an ADN-RN. I now work in a level I surgical/trauma ICU and make $69K/year. You medics and corpsmen can do it too. If you have any questions feel free to ask or PM me.