Lightship WAL 539 (numbered LV 118 when built) was the last lightvessel constructed for the United States Lighthouse Service before the Service became part of the United States Coast Guard. She is currently preserved in Lewes Delaware as a museum ship. Given a list of categories: company, educational institution, artist, athlete, office holder, mean of transportation, building, natural place, village, animal, plant, album, film or written work, what category does the paragraph belong to?
Mean Of Transportation