The B-17 Flying Fortress is, along with the British Avro-Lancaster, the most famed heavy bomber of World War II. More than 12,000 B-17s were built and the planes were the mainstay of the Eighth Air Force's campaign of daylight precision-bombing raids on targets in Germany and the occupied territories. Unsurprisingly, given the B-17s pre-eminent role in the war, many books have been published on the aircraft and the men who flew in them.