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. 67 Squadron RAF recognition was belatedly granted, and thereafter the unit was known in all quarters by its original designation. The unit itself never regarded itself as part of the RFC, and never used its official RFC number – it is considered as the "ancestor" of No. 1 Squadron RAAF and has no real connection with the later RAF unit. In particular, at the time of the formation of the RAF in April 1918 there was no "No. 67 Squadron RFC" to become an RAF unit of that number. Hence the first No. 67 Squadron RAF was the one formed during the Second