The squadron had to develop the tactics to deploy 's ', and undertook some of its training over the dams of the in Derbyshire, as the towers on the dam walls were similar to those to be found on some of the target dams in Germany.The squadron's badge, approved by, depicts the bursting of a dam in commemoration of Chastise. The plan was given the codename and carried out on. It included, and personnel and was formed for the specific task of attacking three major dams that contributed water and power to the Ruhr industrial region in Germany: the. Second World War The squadron was formed under great secrecy at during the on 21 March 1943. 617 Squadron was allocated the MZ for the period April to September 1939, even though the unit did not actually exist at the time. Unsourced material may be challenged and removed.Find sources: – ( May 2017) Between the wars According to the squadron's entry in Flying Units of the RAF by Alan Lake, No.

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