My history teacher told us that should WWIII break out (assuming nuclear weapons weren't used) NATO would win due to superior doctrine and training. How true is this?

Sorry, but your submission has been removed because we don't allow hypothetical questions. If possible, please feel free to rephrase the question so that it does not call for such speculation, and resubmit Otherwise, this sort of thing is better suited for /r/HistoryWhatIf.