He is not identified but because of his rank, there are not very many possibilities as to his ID... One very good possibility is the following. CPT William Henry Long, III. Powelton, Hancock County, Georgia, USA. 29 Mar 1862 (aged 39).
Graduated from Mercer University in 1840, seven years after its founding. First Mayor of Cuthbert, Georgia. Married Sarah Mott Taylor in Monroe County, Georgia, on Aug.Organized Company F, 5th Regiment, Georgia Volunteer Infantry Army of Tennessee, Randolph County, Georgia, on May 10, 1861. Known as the Cuthbert Rifles. William Henry Long, III, died of disease on March 29, 1862, at Tazewell, Tennessee. His body was then taken back to Georgia for burial. Ambrotype is in excellent condition behind mat and glass in full, very good+ to excellent thermoplastic case. I will be adding a scan and a couple of other photos today. Rare museum quality Civil War image.
The item "Confederate Civil War Soldier / Officer 5th Georgia Clinch or Cuthbert Rifles" is in sale since Sunday, March 31, 2019. This item is in the category "Collectibles\Photographic Images\Vintage & Antique (Pre-1940)\Ambrotypes". The seller is "jack_mord" and is located in Woodinville, Washington. This item can be shipped to United States.