I have joint custody of my child and my exgirlfriend ran off with my child. I havent seen them in almost three months. I just recently stopped child support because she has not contacted me at all, nor allowed me to see my child. Can she be arrested and I be granted full custody???

You need to catch up on your child support NOW. If there is a court order, you need to notify the police that she is missing and file contempt charges. I know it is tempting to 'get back' at her by not paying the support, but the reality is that the only person that will have problems from that is YOU.

Im in the military, stationed in NC. Do I call the cops in NC or VA?

where was the mother the last time you had contact with her?