Our man is a private wearing a mounted service jacket with dark trim. With the manner in which wetplate photography reproduced color this would indicate cavalry or artillery. Red usually comes out darker so he may be artillery.
Sunset Rock was a very popular spot for the photographers to setup. Below is a fantastic photo that I let slip thru my hands. Charlie Harris had it at the Chattanooga show before he died and someone else got it.
I've been up there. There is a path up the shooting side of the mountain. I can assume it was used by runners. There were all these bullet scars on boulders. The guy I was in a band with was there and they didn't know much. I explained the battle snd ended it with (paraphrasd here), "Oh. Those pocks you see are from .557 long arms and artillery rounds that struck home. You're walking over the first places that corpse was formed."
It's a beautiful view though a fence is up since they don't want those who have issues and terrible trouble won't have the urge to jump. None of us did we got out there. I lost the picture I think. If I can find them I'll post them.
If you go in the Sumner it's going to be a beast out so bring water. You'll need it.