Flying at 25,000 feet, loaded with 6000 pounds of bombs, bristling with thirteen .50 caliber machine guns, and with a highly trained and motivated flight crew, the B-17 Flying Fortress became the physical symbol of America's Mighty Eighth Air Force. Arrayed against the Eighth Air Force was Nazi Germany's veteran, battle tested air armada the Luftwaffa. But the B-17 didn't go to war alone. The Eighth Air Force also deployed some of the most famous aircraft: the rugged B-24 Liberator, the nimble P-38 Lightning, the P-47 Thunderbolt with its four pairs of deadly wing mounted .50 caliber machine guns, and the quick and high flying P-51 Mustang.