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That is a very good question!how the German and Italian pilots communicated when it was possible?
Monty Python could do skits on the English not understanding the English
More seriously, I believe someone once claimed that the Soviet Union during the cold war had at least 33 different languages spoken within it's borders, not including the Warsaw pact countries. Something that is rarely taken into account when considering the effectiveness or training problems of the Soviet Army.
What about the modern day EU? Is French still the language standard of Europe?