Question: Which military unit garrison is Arlington County, Virginia and The Pentagon?
SPARQL:
SELECT DISTINCT ?uri WHERE {?uri <http://dbpedia.org/ontology/garrison> <http://dbpedia.org/resource/Arlington_County,_Virginia> . ?uri <http://dbpedia.org/property/garrison> <http://dbpedia.org/resource/The_Pentagon>  . ?uri <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/MilitaryUnit>}