U-571 - "Ayer told BBC Radio 4's The Film Programme that he "did not feel good" about suggesting Americans, rather than the British, captured the naval Enigma cipher:"
https://en.wikipedia.org/wiki/U-571_%28film%29#Controversies...
Master And Commander: The Far Side of the World - "...as the producers wished to avoid offending American audiences [...] the fictional opponent was changed from the USS Norfolk to the French privateer frigate Acheron" (Original book was only loosely historical, but my point remains.)
https://en.wikipedia.org/wiki/Master_and_Commander:_The_Far_...