The Standard E-1 was an early AmericanArmyfighter aircraft, tested in 1917. It was the only pursuit aircraft manufactured by the United States during World War I. It arrived late in World War I, and as a result saw more use in the months following the Armistice than those preceding it.
It proved unsuitable as a fighter, but 128 were bought as an advanced trainer. Of these, 30 were powered by the Gnome rotary engine of 100 horsepower and 98 were powered by the LeRhone C-9 rotary engine of 80 horsepower. After World War I, three were modified as RPVs.