N.C. Gen. Stat. § 163-258.27
An individual who no longer qualifies as a covered voter under the provisions of this Article shall not be entitled subsequently to vote by military-overseas ballot under this Article, but if the covered voter was registered under the provisions of this Article that voter's registration shall remain valid for the remainder of the calendar year that voter registered, and that voter shall be entitled to vote in any primary or election for the remainder of the calendar year without having to reregister. If requested by election officials, the voter shall present proof of military status at the time of registration. This section does not entitle a person to vote in North Carolina if that person has become disqualified because of change of permanent residence to another State or because of conviction of a felony.
N.C. Gen. Stat. § 163-258.27