Please answer the following question: The Myrmidon class destroyer was a class of two destroyers that served with the Royal Navy. Myrmidon and Syren were built by Palmers Shipbuilding and Iron Company as part of the group of boats known as the 'thirty knotters'.Concern about the higher speeds of foreign boats had prompted the Admiralty to order new destroyers capable of 30 knots rather than the 27 knot requirement which had been standard. 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