Sergeant Major Sienna Joanne Kilburn, is a Human senior non-commissioned officer who served the in Orbital Drop Shock Trooper in the 105th Shock Troop Division 7th Batallion during the Human-Covenant War and Requiem Playing a minor role in the Great War, she fought in the major battles of Earth, Reach and Colonial planets that had fallen into the Covenants siege. Involved in the events Battle of Installation 04, 05 and the Ark. Battle of Installation 04 nearly ended her life.