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