Do I file NC Taxes as nonresident or resident?

I'm enlisted in the Army with a home of record in Illinois.  My wife is a NC resident (born, raised, school all here) and made a small amount of taxable money this year.  We are filing joint federal tax returns.

Do I file NC state taxes as nonresident(only her income is taxed but she is clearly a resident)?  Or a resident(I'm only here because of the military, she is the only resident)?