The morse in "The Dambusters" was accurateWatching a film on board Barber Memnon, was it "617 Squadron", 2/Sparks ("Supersonic") pulled out a notepad and started scribbling as the Norwegian Resistance sent a Morse message to Britain. Turns out the "message" in the film was real!.........Made me realize he was "conditioned" and quite capable.
I've thought the same thing myself. Maybe they used your name if you were "unattached".I thought by name. How would we know our callsign before being assigned a berth?