I do not find him in the roster, the nearest I could come up with is:

Private Alfred C. Cowan, John McRae's Company B, Mallett's Battalion (Camp Guard), North Carolina Troops, enlisted August 20, 1862. last paid April 30, and was listed absent on detached service on the regiments Sept/Oct 1863 muster roll, shown as having receipted for clothing on June 3, 1864

George Martin