Question: Who served in the military unit 75th Ranger Regiment and played Darth Vader at the end of Return of the Jedi?
Answer(s):
answer: James Earl Jones

SPARQL query:
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.film ns:m.0ddjy .
?x ns:military.military_person.service ?c .
?c ns:military.military_service.unit ns:m.02y_3n4 . 
}