The Nakajima Ki-27 was the main fighter aircraft used by the Imperial Japanese Army Air Force up until 1940. Its Allied nickname was "Nate". The preference of Japanese fighter pilots of the Ki-27's high rate of turn caused the Army to focus almost exclusively on maneuverability, a decision which came back to haunt them later as it handicapped the development of faster and more heavily-armed fighters. The Ki-27 served until the beginning of World War II in the Pacific, escorting bombers attacking Malaya, Singapore, Netherlands East Indies, Burma and the Philippines (where it initially fared poorly against the Brewster Buffalo). The type also saw extensive action against the American Volunteer Group in the early months of the war. Soon outclassed by the American Curtiss P-40s, the Ki-27 was replaced in front line service by the Nakajima Ki-43, with surviving examples continued to serve as a trainer. Info: Wikipedia http://en.wikipedia.org/wiki/Nakajima_Ki-27 Profile: Fighting Aircraft of World War II Published by Salamander Books.