SELECT DISTINCT COUNT(?uri) WHERE { ?x <http://dbpedia.org/property/commandStructure> <http://dbpedia.org/resource/Marine_Aircraft_Group_13> . ?uri <http://dbpedia.org/ontology/militaryUnit> ?x . }
Count everyone who was in the military unit which is structured like the Marine Aircraft Group 13 ?
SELECT DISTINCT COUNT ( ?v ) WHERE { ?v property:military_unit ?m . . ?m property:command_structure resource:Marine_Aircraft_Group_13 }
10
There are [10] people whose military unit's command structure is Marine Aircraft Group 13.
There are [10] people whose military command structure is the 13th Marine Aviation Group.