Plot hole: The factory in Norway has to be destroyed - at huge cost - as it is producing fuel for the V2 rocket. That fuel was ethanol - ordinary industrial alcohol. There is no reason at all to have a specialised factory hundreds of kilometers away producing such a simple chemical. The Germans could have manufactured it in virtually unlimited quantity in an ordinary brewery - and there were plenty of those in Germany.
633 Squadron (1964)
Ending / spoiler
Directed by: Walter Grauman
Starring: Cliff Robertson, Harry Andrews, George Chakiris, Maria Perschy
Everyone dies except Hopkinson (Robertson's crewmate) but the target is destroyed correctly.
Nikki Williams
More mistakes in 633 Squadron
Trivia: We can see that FLTLT 'Digger' Gillibrand (John Meillon) is wearing a uniform that is of a much darker blue than the other pilots. Australian Air Force uniform of the era was dark blue rather than the RAF blue-grey; and purportedly made from much better material as well.
Answer: He says "You can't kill a squadron".
Bishop73