Though I’m a bit late on posting this, the Lawyerist blog has a great interview with an active duty Marine Corps Judge Advocate: http://lawyerist.com/interview-with-john-ferriter/.  

Capt Ferriter provides a lot of helpful information for anyone considering becoming a Judge Advocate or for anyone that just wants to find out more about the career–including why Marine attorneys aren’t JAGs, they are Judge Advocates.