How do I help to gain custody of my child if I am a unmarried father and a reserved soldier as well, my ex moved out of the state that I lived in and she wants to move my son into another state with her, is there anything else that can be done?

Certainly. Sue her for custody or visitation. If she moves your child to another state, the courts of your state will only have jurisdiction for the next six months (or, if he is less than 6 months of age, less time), so do it ASAP.