Heavy bomber version of the bouncing bomb, was used to destroy the Mohne and Eder dams by Lancasters from the specially recruited and trained 617 Squadron, often known as the Dambusters, under Wing Commander Guy Gibson. In March and April 1945, as the war in Europe was ending, Lancasters dropped Grand Slams and Tallboys on U-boat pens and railway viaducts across north Germany. At Bielefeld more than of railway viaduct was destroyed by Grand Slams creating an earthquake effect, which shook the foundations. The Boeing B-29 Superfortress was a development of the Fortress, but a larger design with four Wright R-3350 Duplex-Cyclone
76th Flying Training Wing (World War II) 76th Flying Training Wing (World War II) The 76th Flying Training Wing was a wing of the United States Army Air Forces. It was assigned to the Army Air Forces Flying Training Command, and was stationed from 1943-46 at Smyrna Army Airfield, Tennessee. There is no lineage between the United States Air Force 76th Maintenance Wing, established on 5 February 1942 as the 76th Observation Group at MacDill Field, Florida and this organization. The wing was a heavy bomber training wing of Eastern Flying Training Command. Its schools provided four-engine heavy bomber transition training for experienced pilots who were moving