He is a Colour Sergeant of the 15th Regiment of Foot, or East Yorkshire Regiment if after July 1881. The chain emerging from his white piped full dress tunic front is for a pocket watch. The Colour Sergeant was the senior enlisted man in an infantry company and fulfilled a role that we would nowadays call company sergeant major. The famous senior NCO portrayed in the film ZULU depicted a Colour Sergeant. At the time of the photo there were 8 companies, A to F, and each had a Colour Sergeant. It was from the Colour Sergeants that the two most senior men in a battalion, the Quarter Master Sergeant and Sergeant Major of Battalion were selected. Some of them retired to become Musketry Instructor Sergeants in auxiliary units at home in Britain. He also wears the typical scarlet worsted shoulder sash worn by all sergeants of infantry. His collar badge is the 8-point star first adopted by the regiment as it’s insignia and that previously adorned the soldiers buttons. It continued to do so for officers.