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. 18 Squadron RAF No. 18 Squadron RAF No. 18 Squadron of the Royal Air Force operates the Boeing Chinook from RAF Odiham. No. 18 Squadron was the first and is currently the largest RAF operator of the Chinook. Owing to its heritage as a bomber squadron, it is also known as No. 18 (B) Squadron. The squadron was formed on 11 May 1915 at Northolt as part of the Royal Flying Corps. It arrived in France on 19 November 1915, principally equipped with the Vickers FB5 'Gunbus', supplemented by a few Airco DH.2s and Bristol Scouts, and operating in the Army cooperation role.