#aircrewman  a member of an aircrew
  supertype:  crew_member__crewman  a member of a flight crew
  member of:  aircrew
  subtype:  bombardier  the member of a bomber crew responsible for using the bombsight and releasing the bombs on the target
  subtype:  flight_engineer  the flight crewman responsible for mechanical operation while in flight
  subtype:  navigator.aircrewman  the member of an aircrew who is responsible for the aircraft's course
     subtype:  astrogator  the navigator of a spacecraft

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