Built by Nakajima as a Ki-44-II Hei version with C/n 2143. The aircraft had brown-green upper surfaces, light grey-green undersides and the Japanese symbol も ('Mo') on the starboard rudder only. The aircraft shows signs of serious weathering, as it saw previous action over China and Formosa before the unit was transferred to the Philippines in November 1944. It is not known whether the aircraft was ever restored to flying conditions at TAIU-SWPA, but we do know that it got assigned the S18 tail code. Previously C/n 2143 and C/n 2068 (S11) have been mixed-up in research, photographs of what turned out to be C/n 2143 were identified as being from C/n 2068.
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