The Nakajima Ki-43 Hayabusa (隼, Peregrine falcon), formal Japanese designation Army Type 1 Fighter (一式戦闘機, Ichi-shiki sentōki) is a single-engine land-based tactical fighter designed and produced by the Japanese manufacturer Nakajima Aircraft Company. The Allied reporting name was "Oscar", but it was often called the "Army Zero" by American pilots because it bore a certain resemblance to the Mitsubishi A6M Zero, the Imperial Japanese Navy's counterpart to the Ki-43. It was the Imperial Japanese Army Air Service's (IJAAS) first all-metal enclosed cockpit aircraft with retractable landing gear.