PrincessH,
I am not sure about the Navy etc, but in the Army an LPN/LVN is an enlisted MOS. You are considered a 91W (Healthcare Specialist /Medic) with the additional skill identifier of M6 (LPN). I think the Army is in the process of changing the enlisted Medical MOS structure so 91WM6 may be old school by now. I know that if you were to obtain your NREMT-B as well as your LPN and then enlist as a 91WM6 you could skip most of AIT as well as enter with advanced rank under the CAS program (Civilian Acquired Skills).
As far as obtaining you RN after enlistment... that depends on your motivation as well as the "needs of the Army". It can be done but it is a tough road to hoe.
If you are intent on serving in the Nurse Corps. I am not sure of your age etc but my advice would be to finish nursing school and obtain your RN prior to service. I am not attempting to discourage you from enlisting if that is what you want to do (Personally, I think prior enlisted make for= better officers.) ... God knows our military needs enlisted to function but if I am understanding your question correctly, it sounds like your ultimate goal is to serve as an RN. If that is correct then finish school first....ROTC is a VERY good option.
Just my

worth. Hope that helped.
66HM5
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