PHOTO (Army Athletics): Arik Smith against Air Force. Visit my website homepage, TomShanahanReport By TOM SHANAHAN The black-and-white photograph dates to the Civil War, providing a starting point to trace Arik Smith’s family history of military service. A Union Army Black man tends to a general’s horse in the albumen-style image. But the free man is not attached to just any Army division or serving under any general. “He cared for Gen. Sherman’s horse,” says Smith, West Point’s…