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
Motor Torpedo Boat PT 617 Motor Torpedo Boat PT 617 PT 617, also known as Torpedo Boat "PT-617, Big Red Cock and Dragon Lady", "is the sole surviving 80' Elco type PT boat and represents the United States's most heavily used, highly favored, and combat-tested PT boat type in World War II." She is a museum ship at the PT Boat Museum in Fall River, Massachusetts. The Elco type boat was the predominant type and is the same type as the famous commanded by John F. Kennedy; the "Higgins" boat is the other type. "PT-617" was declared a National Historic Landmark in 1989. "PT-617" is