Given the question: USS Aspro (SS-309) - USS Aspro (SS/AGSS-309) a Balao-class submarine was the first ship of the United States Navy to be named for the aspro a fish found abundantly in the upper Rhone River. According to legend the aspro comes to the surface only in bad weather when other fishes take refuge near the bottom. This trait gave rise to its nickname Sorcerer.Aspro was laid down on 27 December 1942 by the Portsmouth Navy Yard in Kittery Maine; launched on 7 April 1943; sponsored by Mrs. William L. 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?
The answer is:
Mean Of Transportation