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Mil got it right with Mi-8. I can't think of any other helicopter that has nearly as many derivatives that fill so many roles, both combat and civil.
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The Mil Mi-14 (NATO Reporting Name Haze) is a anti-submarine helicopter developed from the Mi-8
Image from Su58 from Deviantart
Mil got it right with Mi-8. I can't think of any other helicopter that has nearly as many derivatives that fill so many roles, both combat and civil.