machine_question: who did darth vaders voice and is the person that served in the military unit 75th Ranger Regiment
question: Who is the 75th Ranger Regiment solider, that did the voice of Darth Vader?
sparql: PREFIX ns: <http://rdf.freebase.com/ns/>
  SELECT DISTINCT ?x
  WHERE {
  FILTER (?x != ns:m.0f2y0)
  FILTER (!isLiteral(?x) OR lang(?x) = '' OR langMatches(lang(?x), 'en'))
  ns:m.0f2y0 ns:film.film_character.portrayed_in_films ?y .
  ?y ns:film.performance.actor ?x .
  ?y ns:film.performance.special_performance_type ns:m.02nsjvf .
  ?x ns:military.military_person.service ?c .
  ?c ns:military.military_service.unit ns:m.02y_3n4 . 
  }
webqsp_question: who did darth vaders voice