Here a little bit more about the 801st BG according to the 8th AAF site:
The first group to use Harrington was the 801st Bombardment Group (Provisional), arriving from RAF Alconbury on 25 March 1944. The 801st Bomb Group became best known as the Carpetbaggers. The mission of the Carpetbaggers was to fly Special Operations missions which entailed delivering supplies to resistance groups in enemy occupied countries.
In August 1944, the 801st Bombardment Group was absorbed by the 492d Bombardment Group (Heavy). The 492d was a hard luck B-24 group which had lost 52 aircraft to enemy action in only 89 days, suffering 588 men killed or missing. Rather than try to rebuild the shattered group, the group was stood down and the surviving members were reassigned to other units in theater. When assigned to Harrington, the 801st Bombardment Group (Provisional) was inactivated in a name-only manner. Headquarters and the ground echelon of the 801st were stood up as the 492nd.