sentences: "De Soto County" was laid down 15 September 1956 at Avondale, Louisiana by Avondale Marine Ways, Inc.; launched on 28 February 1957; sponsored by Mrs. C. Horton Smith; and commissioned on 10 June 1958 with Lieutenant Commander Daniel A. York in command.For almost the entire length of her active service, "De Soto County" was assigned to the Amphibious Force, Atlantic Fleet.