Sean Miles knew every Star Wars movie by heart. In high school, he hated homework and relished football. As a fullback at Clover Hill High in Chesterfield County, Miles dreamed of becoming a professional football player. He loved the Redskins, but he lived the Marines. He vowed his son, 2½ year-old Tyler, would grow up strong. This week, Miles died proving what strength means. Fewer than two weeks before he was due to wind up a seven-month tour of duty in Iraq, Miles was killed in action Tuesday in the Iraqi town of Karmah, about 50 miles west of Baghdad....