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
Ohio State Route 617 just from the intersection, resumes to the northeast; and SR 617 goes to the southeast. Traversing southeast from SR 170, SR 617 passes through a primarily residential area, intersecting a few side streets as the route makes its way out of Petersburg. Once back into a more rural setting, SR 617 passes through farmland, with a few homes dotting the landscape. Arriving at the Pennsylvania state line, SR 617 comes to an end. The highway continues into Pennsylvania as PA 351. SR 617 was designated in 1937 along the path that it currently occupies. No major changes have taken place