I mean according to the battle of Castle Itter, there was a SS officer that helped the allies out.
Dunkirk Movie
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Shooting down 5 planes made you an ACE fighter pilot; and whilst it wasn’t unheard of to become an ACE in a day, it certainly wasn’t common.
Further… Tom Hardy’s spitfire never seems to run out of ammunition, when in fact, spitfires only had a matter of seconds of ammuntion (40 to 60 seconds continuous fire? I am sure someone here can confirm?).
This is no different than that American victory at one Pearl Harbor movie, where the cook shoots down 300 Japanese planes and sinks 6 carriers and dies from stepping on a milk cartoon followed by Tokyo getting totally destroyed by 15 bombs and surrendering.
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The movie celebrates what Britain did.