The 906th Air Refueling Squadron is an active United States Air Force unit. It is an active associate squadron and part of the 375th Air Mobility Wing at Scott Air Force Base, Illinois. The squadron was first activated in United States military buildup just before World War II as the 16th Reconnaissance Squadron. After the attack on Pearl Harbor, the squadron participated in the Antisubmarine Campaign of the American Theater of Operations. As the 406th Bombardment Squadron it also served in the Aleutian Islands Campaign of the Pacific Theater of Operations and several campaigns in the European Theater of Operations. The squadron was unusual in that it received campaign credit in three different theaters of operation.