Dr Gaston's service records filed with Confederate Officers gives his full name as John Brown Gaston. Appointed Surgeon July 15, 1861. Relieved; assigned to hospital duty at Richmond, Virginia, July 16, 1864. See Dictionary of Alabama Biography, vol 3:644.
Based on your work with the 14th Alabama Regiment, my notes on that command would be improved with the courtesy of your review. With your permission I will send that document to your attention.