Question: Name the military units whose command structure's headquarters is The Pentagon?
SPARQL:
SELECT DISTINCT ?uri WHERE { ?x <http://dbpedia.org/property/headquarters> <http://dbpedia.org/resource/The_Pentagon> . ?uri <http://dbpedia.org/ontology/commandStructure> ?x  . ?uri <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/MilitaryUnit>}