Question: Which branch of american military have both George Siebels jr and Leroy Collins served?
SPARQL query:
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
PREFIX prop: <http://dbpedia.org/property/>
PREFIX onto: <http://dbpedia.org/ontology/>
SELECT DISTINCT ?uri WHERE { <http://dbpedia.org/resource/George_G._Siebels,_Jr.> prop:branch ?uri. <http://dbpedia.org/resource/LeRoy_Collins> prop:branch ?uri . ?uri rdf:type onto:MilitaryUnit}