Given the question: USS PT-121 was a motor torpedo boat of the United States Navy built by the Electric Launch Company (ELCO) of Bayonne New Jersey launched in 1942 and sunk in a friendly fire incident on 27 March 1944. 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?
The answer is:
Mean Of Transportation