During World War II, its predecessor unit, the 379th Bombardment Group was a VIII Bomber Command B-17 Flying Fortress unit in England. Assigned to RAF Kimbolton in early 1943, the group flew more sorties than any other bomb group in the Eighth Air Force, and dropped a greater bomb tonnage than any other group. The combat record of the 379th was the most successful of all the Eighth Air Force heavy bomber groups, receiving two Distinguished Unit Citations.