B-24 Liberator Units of the Fifteenth Air Force, Robert F. Dorr. The B-24 was most closely associated with the war in the Mediterranean. Although the Fifteenth Air Force only came into existence half way through the North African campaign, Dorr begins by looking at the role played by the B-24 before that date, before moving on to follow the Fifteenth from Africa to Italy, but the main focus is on the strategic bombing campaign waged over much of occupied Europe and southern Germany by the B-24s of the Fifteenth.