Just tried to look him up in the Roster of The Confederate Soldiers of Georgia, with no luck for John Kelly, need to make sure the last name is spelled right and not Kelley, also need to know if they have his full name, a lot of initials, etc. The following is the Civil War Soldiers and Sailors system of units that would have been at Chickamauga;

3
Kelly, John
Confederate

1st Regiment, Georgia Regulars

10
Kelly, John
Confederate
Infantry
9th Battalion, Georgia Infantry

17
Kelly, John
Confederate
Infantry
47th Regiment, Georgia Infantry
22
Kelly, John
Confederate

Smith's Legion, Georgia

23
Kelly, John A.
Confederate
Infantry
5th Regiment, Georgia Infantry

26
Kelly, John D.
Confederate
Infantry
9th Battalion, Georgia Infantry

32
Kelly, John J.
Confederate
Infantry
3rd Battalion, Georgia Infantry
38
Kelly, John T.
Confederate
Sharpshooters
2nd Battalion, Georgia Sharpshooters

42
Kelly, John W.
Confederate
Infantry
20th Regiment, Georgia Infantry