The Sendai-class cruisers ( Sendai-gata keijun'yokan) were a group of warships operated by the Imperial Japanese Navy. Named after rivers they participated in numerous actions during the Pacific War and were mainly used as destroyer flotilla leaders. 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?
A:
Mean Of Transportation