I may be wrong, but I think the John S. Cook you have is John S. Cook, Co. C, 25th TN Infantry. He was 23 when he joined the company as a musician. There are several other Cook's in this regiment. You can order his service record from the link at the top of this page. Hope this helps! -- Jim Huffman, Gainesville Vols, SCV Camp 373, Pearl River County, MS