Question: Which office holder's military unit is USS Kittiwake  and constituency is Castro District, San Francisco ?
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 {?uri onto:militaryUnit <http://dbpedia.org/resource/USS_Kittiwake_(ASR-13)> . ?uri prop:constituency <http://dbpedia.org/resource/Castro_District,_San_Francisco>  . ?uri rdf:type onto:OfficeHolder}