RAF personnel learning to identify aircraft during the Second World War, 1941. Instructor and pupils at an Initial Training Wing using models: 'particularly valuable...because they enable the changing aspects of the aircraft as it varies its angle of approach to be studied...Aircraft recognition has been recognised to be of supreme importance...on the accuracy and swiftness with which aircraft can be identifed the effectiveness of the defensive or offensive action often depends.' From "The Royal Air Force in Pictures", 2nd edition, by World War I flying ace Major Oliver Stewart. [Country Life Ltd, London, 1941]