The 731st Expeditionary Attack Squadron (731st EATKS) is a unit of the United States Air Force. It was activated on 4 March 2021 at the Romanian Air Force 71st Air Base in Câmpia Turzii. The unit is part of the 31st Operations Group and operates MQ-9 Reaper unmanned aerial vehicles. As the 731st Bombardment Squadron, it was last active during the Korean War, assigned to the 452d Bombardment Group but attached to the 3d Bombardment Group at Iwakuni Air Base, Japan, where it was inactivated on 25 June 1951.