Established as the 622d Bombardment Squadron (Dive) on 25 Jan 1943, converted from A-24 Banshee (Dauntless) dive bombers to P-39 Aircobra fighters in August and was redesignated the 508th Fighter-Bomber Squadron. After training was completed at Myrtle Beach AAF, South Carolina, deployed to the European Theater of Operations (ETO), assigned to IX Fighter Command in England where it was assigned P-47 Thunderbolts and was again redesignated as the 508th Fighter Squadron.