Sergeant Cornelius V. Moore of 100th New York Volunteers, Company B. He was also a sergeant in the 39th Illinois Regiment, and a corporal of the 106th New York Volunteers. In the 11th Vermont Regiment, he was a private. IN the photo, he is holding a musket, with bayonet.
In the letter, he is asking for an honorable discharge, and is writing to the secretary of war, detailing some of his service.