Creators Rick Berman and Michael Piller didn't want to have two Star Trek series galloping about the galaxy in different starships.
He is mentioned in the Reeves-Stevens novel "Federation" as becoming an admiral after commanding two other starships.
Long ago, these shapeshifting beings traveled the galaxy in advanced starships.
As of stardate 49648.0, Miles had engaged in over 230 separate combat situations, served aboard half a dozen starships and had been decorated by Starfleet on 15 separate occasions.
That all changed in Star Trek: The Next Generation - starships were now floating cities, complete with bars, shops, schools and crew members' families aboard.