Question: Count everyone who was in the military unit which is structured like the Marine Aircraft Group 13 ?
SPARQL query:
PREFIX prop: <http://dbpedia.org/property/>
PREFIX onto: <http://dbpedia.org/ontology/>
SELECT DISTINCT COUNT(?uri) WHERE { ?x prop:commandStructure <http://dbpedia.org/resource/Marine_Aircraft_Group_13> . ?uri onto:militaryUnit ?x  . }