The Boeing P-26 Peashooter was a fighter aircraft developed in the late 1920s for the United States Army Air Corps. It was notable for being the first all-metal monoplane fighter in U.S. service, featuring a distinctive round fuselage and an open cockpit. The P-26 was powered by a Pratt & Whitney R-1340 Wasp engine, allowing it to reach speeds of around 200 mph. Entering service in 1933, the P-26 served primarily in the 1930s and was used in various roles, including training and air defense. Although it was eventually replaced by more advanced aircraft, the Peashooter remains an important part of aviation history, symbolizing the transition from biplanes to modern fighters like the P-51 Mustang.