A downed Japanese Mitsubishi A6M Zero was discovered on Akutan Island, Alaska; it was later rebuilt and flown to devise tactics against the aircraft during World War II.

The Akutan Zero, also known as Koga's Zero (古賀のゼロ) and the Aleutian Zero, was a Mitsubishi A6M2 Model 21 Zero Japanese fighter aircraft piloted by Petty Officer Tadayoshi Koga, that crash-landed on Akutan Island, Alaska Territory, during World War II. It was found intact by the Americans in July 1942 and became the first Zero acquired by the United States during the war that could be restored to airworthy condition. It was repaired and flown by American test pilots. As a result of information gained from these tests, American tacticians were able to devise ways to defeat the Zero, which was the Imperial Japanese Navy's primary fighter plane throughout the war.