Well I cant speak for the Army, but being a Navy vet, and at one point a dual military couple; I can tell you the General Rule they go by for Orders is that they can station you no further than 50...
As prior enlisted Navy (ABE2); I will tell you if you go in with LVN/LPN you will be an enlisted corpsman and unless you get a guaranteed C School in your contract theres no telling what youre...