The guys below were in the Whitfield / Ross Texas Cavalry Brigade. Two could have been the A.J. your looking for.
McCLURE JAMES B. B 3 CPL
McCLURE, James B., Cpl., Co. B, 3rd TX CAV
McCLURE JOHN A. K 3 PVT
McClURE, John A., Pvt., Co. K, 3rd TX CAV
McCLURE O. G. D 6 PVT
McCLURE, O. G., Co. "D”, 6th TX CAV
McCLURE PORTER G. D 6 PVT
McCLURE, Porter G., Co. "D”, 6th TX CAV
McCLURE WILLIAM J. K 6 PVT
McCLURE, William J., Co. "K”, 6th TX CAV