Question: Where is the person from whose military rank is Airman first class?
SPARQL:
SELECT DISTINCT ?uri WHERE { ?x <http://dbpedia.org/ontology/militaryRank> <http://dbpedia.org/resource/Airman_first_class> . ?x <http://dbpedia.org/property/state> ?uri  . ?x <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/Person>}