This second volume, out of a total of four, of the history of the North American Aviation P-51 Mustang and P-82 Twin Mustang details the operational history of the various versions of the Mustang which served in the Royal Air Force and in the other countries air forces, from Bolivia to Uruguay, including Germany and Communist China. Appendix 2 provides the performance characteristics of the significant versions. South African and South Korean Air Forces operations will be addressed in Volume III in conjunction with US operations.