Merriam Press World War 2 In Review Special Number 18. First eBook Edition, 2016. Eighteenth in the Special series of the World War 2 In Review journal. Pictorial overview with 316 B&W and color photos, illustrations and drawings of the Boeing B-17 Flying Fortress, a four-engine heavy bomber aircraft developed in the 1930s for the United States Army Air Corps (USAAC). The B-17 was primarily employed by the United States Army Air Forces (USAAF) in the daylight precision strategic bombing campaign of World War II against German industrial and military targets. Text and photos covers design, experimental models, production, early service models, and all main B-17 models throughout World War II.