In July 2004, the Defence Secretary announced that 41 Squadron would be disbanded once again, on 31 March 2006, as a part of a re-organisation of the Defence Forces following a Government spending review, and the so-called Gershon efficiency study. A White Paper, titled "Delivering Security in a Changing World: Future Capabilities", foresaw the retirement of the RAF's Jaguar aircraft two years early and the closure of RAF Coltishall. Advances in technology, it reasoned, would mean air defence could be maintained with fewer aircraft, thus allowing older equipment to be withdrawn from service earlier than originally intended. The authors planned that the RAF's future air combat force would be based around the multi-role Typhoon and Joint Combat Aircraft, in co-operation with the Tornado GR4 and Harrier GR7/GR9. Furthermore, the paper intended to reduce RAF trained strength from 48,500 to 41,000 by 1 April 2008.