Q:Nitro-class ammunition ship -  The Nitro-class ammunition ships are a class of three auxiliary vessels of the United States Navy. Launched in 1958-1959 they were among the first specialized underway replenishment ships built after the Second World War to carry munitions. These and the Suribachi-class ammunition ships are sometimes considered to form a single class. A fourth ship of the class was planned under the 1959 military construction program but was eventually cancelled before construction began. Given a choice of categories company, educational institution, artist, athlete, office holder, mean of transportation, building, natural place, village, animal, plant, album, film or written work, the text refers to which one?
A:
Mean Of Transportation