The Mackensen class was the last class of battlecruisers to be built by Germany in World War I. The class was to have comprised four ships: Mackensen the name ship Graf Spee Prinz Eitel Friedrich and Furst Bismarck. The lead ship of the class was named for August von Mackensen a prominent military commander during the war. None of the vessels were completed as shipbuilding priorities during the war were redirected towards U-boats. They were broken up in the early 1920s. 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