Which countries militaries fought the SFOR battle?
SELECT DISTINCT ?uri WHERE { ?x <http://dbpedia.org/property/battles> <http://dbpedia.org/resource/SFOR> . ?x <http://dbpedia.org/ontology/battle> ?uri  . ?x <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/MilitaryPerson>}
SFOR