No. 5 Group RAF effective squadrons of Bomber Command, personified by No 617 Squadron the "Dambusters", formed from 5 Group aircrew in March 1943. Most of the group's main airfields were around Lincoln, including RAF Scampton. By the end of the war the group had grown to 15 squadrons. The group was noted for its high accuracy bombing, being involved the sinking of the "Tirpitz" in November 1944 and the shattering of the strategic Bielefeld railway viaduct in March 1945. The Group introduced new weapons operationally, including Barnes Wallis's "bouncing" and his Tallboy and Grand Slam "earthquake" bombs. The group was disbanded on 15
No. 76 Squadron RAF No. 4 Group, RAF Bomber Command. The Squadron moved to RAF Middleton St. George in June 1941, returning to Linton-on-Ouse in July 1942. The squadron moving again, this time to RAF Holme-on-Spalding Moor in June 1943 as part of a policy to allow the newly formed Canadian 6 Group to use the better equipped RAF stations that had been built pre-war. The Squadron had a substantial number of Norwegian pilots and aircrew. From August 1942 to April 1943, No 76 Squadron was commanded by Wing Commander Leonard Cheshire. With the rest of No.4 Group, 76 Squadron was transferred to RAF