The Boeing B-17 Flying Fortress was a four-engine heavy bomber extensively used by the United States Army Air Forces (USAAF) during World War II. Known for its defensive firepower, it was a key component of strategic bombing campaigns against Germany and Japan. It was powered by four Wright R-1820 Cyclone engines and could carry up to 8,000 pounds of bombs. The B-17’s heavy defensive armament and long range made it a formidable aircraft, although it was often vulnerable to German fighters.