Which senator served in military units VMF-155 and VMF-218?
SELECT DISTINCT ?uri WHERE { ?uri <http://dbpedia.org/ontology/militaryUnit> <http://dbpedia.org/resource/VMF-155> . ?uri <http://dbpedia.org/ontology/militaryUnit> <http://dbpedia.org/resource/VMF-218> . ?uri <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/Senator>}
VMF-155 VMF-218