premise: USS "Spence" (DD-512), a Fletcher class destroyer, was laid down on 18 May 1942 by the Bath Iron Works, Bath, Maine; launched on 27 October 1942; sponsored by Mrs. Eben Learned; and commissioned on 8 January 1943, Lieutenant Commander H. J. Armstrong in command. The ship was named for Robert T. Spence, superintendent of the construction of USS "Ontario" (1813), and captain of USS "Cyane" (1815).
hypothesis: USS "Spence" (DD-512) is a Beltcher class destroyer.
reason: It is a Fletcher class destroyer. 