History of Lincolnshire the RAF Officer Training College after the formation of the RAF in April 1918. RAF Swinderby was a Polish-manned RAF station and from 1964, the RAF's main Recruit Training Camp. RAF Scampton, was the home base of 617 Squadron. Lincolnshire still has the strongest claim to being the 'home' of RAF Bomber Command, playing host to many squadrons, including the Lancaster bombers of the famous 617 "Dambusters" squadron who were based at RAF Scampton. There were two Bomber Groups based in the county – No. 1 in the north and No. 5 Group in the centre and south. The Battle
No. 421 (Reconnaissance) Flight RAF were issued to 421 Flight and the Hurricanes went to other squadrons. No. 421 (Reconnaissance) Flight RAF No. 421 (Reconnaissance) Flight was a specialist RAF fighter flight created on 21 September 1940 to patrol the Channel and provide early warning of the types of incoming Luftwaffe raids from occupied France. It was later expanded to full squadron strength and renumbered as No. 91 Squadron on 11 January 1941. Its role led to its pilots being nicknamed "Jim Crows". In late September 1940, Air Chief Marshal Hugh Dowding was faced with two problems. The first was a change in Luftwaffe tactics.