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
Wing leader Fleet Air Arm (FAA) wings, which could comprise up to five naval air squadrons. Among the FAA's wing leaders was Lieutenant Commander Dickie Cork, who was appointed to lead a Vought F4U Corsair wing aboard in 1943. The Royal Australian Air Force (RAAF) adopted the RAF concept of large fighter formations led by wing leaders for operations in the South West Pacific theatre, starting in the North-Western Area in 1943, with an air defence campaign that the RAAF saw in terms of another Battle of Britain. Wing Commander Clive Caldwell was appointed wing leader of No. 1 (Fighter) Wing, comprising