As the title says this is Captain Charles Newport, he is 30 years old. Being of a young age for an Officer of his rank has gone to this guys head a little bit. He is annoyingly superior and sucks up to the Colonel during discussions, trying to curry favour over the Lieutenant by claiming that his attempts to meet with the Native Americans are fruitless.
He (like the Alpha) is battle hungry and will shoot an Indian on sight believing them to be vicious murdering savages and nothing more. He has a constant feud going on with the Lieutenant who despite being below him in rank carries more respect and authority with most of the soldiers, even the Colonel, and in the Captain's eyes does not show him the appropriate level of courtesy.
He directly mirrors the Alpha in the story, and his likeness is based on Gary Oldman.