This Ki-43-II Oscar of the 204th Hiko Sentai photographed at Lashio, Burma in March 1945 appears to display the "old" form of marking for that unit when it was the Kyôdô ('Teaching') Hiko Dai 204 Sentai - an arrow "flight" on the rear fuselage behind the Hinomaru. This was said to be inspired by a historical warrior Chinzei Hachiro whose name evoked the location where the unit was first formed in April 1942 at Chinzei in Manchuria. The wingtips and top section of the tail fin (and perhaps rudder) appear to be painted white. The form of the mottle and typical paint wear is also usefully shown in this view for anyone contemplating an(other) Oscar model.
After the change of designation the unit insignia became a "flash" on the leading edge of the fin with small "wings" extending onto the inboard forward edges of the tailplane in the Chutai colours, said to represent the flight of the crane. The 204th were active over Burma as an Oscar fighter unit from November 1943 to October 1944 when they moved to the Philippines to counter US forces landing there. After withdrawing to Japan in December 1944 they supposedly re-equipped with the Ki-43-III Ko and then re-deployed to Saigon in French Indo-China in February 1945. As part of the secret 'Kaku manouevres' to increase air defence in Japan the 204th was to be shifted to Formosa (Taiwan) as part of the 25th Independent Air Brigade at the end of June 1945, together with the other elements of the Brigade - the 13th fighter, 50th fighter, 8th light bomber and 58th heavy bomber Sentai. Part of the unit moved to Formosa in March 1945 and was re-designated Makoto (誠 - sincerity, fidelity) 204th Hiko Sentai to participate in Tokubetsu kôgeki - tokkôtai - 'special attack' suicide operations against Allied naval forces.
Image credit: NARA