No. 5 Group was a Royal Air Force bomber group of the Second World War, led during the latter part by Sir Ralph Cochrane . Cochrane was an advocate of precision low-level marking, and lobbied heavily to be allowed to prove himself, and that 5 Group could attempt targets and techniques that 8 Group would not.
Cochranes No. 617 Squadron proved his point when they broke the Ruhr dams from a height of 60 feet, and later, using the new Stabilised Automatic Bomb Sight, achived an incredible accuracy of only 94 yards at the V Weapon launch site at Abbeville. 5 Group invented various techniques, such as the '5 Group corkscrew' to evade enemy fighters, and the '5 Group quick landing system'.