The 89th Attack Squadron is a United States Air Force unit assigned to the 432d Wing as a tenant unit at Ellsworth Air Force Base, South Dakota. It has been active as a remotely piloted aircraft (drone) squadron there since 2011. The squadron was first activated as the 89th Aero Squadron at Kelly Field, Texas during World War I. It deployed to France in 1917, where it constructed fields and trained observers, In 1918 it briefly trained as an observation unit, but the unit did not move to the front before the Armistice.