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No.631 Squadron was a target-towing and gun laying training squadron that was based in Wales from its formation 1943 until the end of the Second World War.
The squadron was formed on 1 December 1943 by the merger of Nos.1605 and 1628 Flights. At first it only operated the Hawker Henley, using it as a target tug to provide targets for gunnery ranges in Wales. This role continued to the end of the war, although the Henleys were replaced with Martinets in September 1944 and with Vengeances and Spitfires at the end of the fighting.
In March 1944 the squadron was given a number of Hurricanes and these were used for gun laying training, with observers in the aircraft correcting the fall of shot from the guns.
The squadron continued to perform these two roles after the end of the and survived until 11 February 1949 when it was renumbered as No.20 Squadron.
December 1943-February 1945: Hawker Henley III
March 1944-July 1945: Hawker Hurricane IIC
September-October 1944: Martinet I
December 1944-February 1945: Martinet I
May 1945-May 1947: Vultee Vengeance IV
June-July 1945: Supermarine Spitfire VC
June 1945-February 1949: Supermarine Spitfire XVI
August 1948-Febuary 1949: de Havilland Vampire F.1
December 1943-May 1945: Towyn
May 1945-February 1949: Llanbedr
Squadron Codes: -
December 1943-February 1949: Target-towing and gun-laying practice