 Rollo was promoted to brigadier on 31 December 1998 with seniority from 30 June 1998.He was appointed aide-de-camp to Queen Elizabeth II on 1 November 2000, and relinquished the appointment on 28 June 2002.He was deployed as General Officer Commanding Multi-National Division (South East), Iraq in July 2004 and became Assistant Chief of the General Staff in January 2005.