#crew_member__crewman  a member of a flight crew
  supertype:  #skilled_worker__skilledworker__trained_worker__trainedworker  a worker who has acquired special skills
  member of:  #crew
  subtype:  #aircrewman  a member of an 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
  subtype:  #privateersman__privateer  an officer or crew member of a privateer
     instance:  #Sir_John_Hawkins__Hawkins__Hawkyns__Sir_John_Hawkyns

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