Originally Posted by David A. Goldfarb
I like Bill's suggestion. It looks like the moustache in the fourth and eleventh images and the uniform of the ninth image on this page, and he's got two stars--
It does look a bit like Chamberlain; but Chamberlain would have been much younger as a Brigadier General of Volunteers and was mustered out as a Major-General of Volunteers.
John, Mount Vernon, Virginia USA