Pick one category for the following text. The options are - company, educational institution, artist, athlete, office holder, mean of transportation, building, natural place, village, animal, plant, album, film or written work. USS Douglas County (LST-731) - USS Douglas County (LST-731) was an LST-542-class tank landing ship built for the United States Navy during World War II. Named after counties in 12 states she was the only U.S. Naval vessel to bear the name.LST-731 was laid down on 27 December 1943 at Pittsburgh Pennsylvania by the Dravo Corporation of Neville Island; launched on 12 February 1944; sponsored by Mrs. A. J. Ackerman; and commissioned on 30 March 1944 with Ensign K. S. McCann Jr. in command.
The answer to this question is:
Mean Of Transportation