USS Cachalot (SC-4/SS-170), a United States Navy submarine and the lead ship of her class, known as the "V-boats", was the only ship of the United States Navy to be named for the sperm whale. Her keel was laid down by the Portsmouth Navy Yard. She was launched on 19 October 1933 as V-8 (SC-4) sponsored by Miss K. D. Kempff, and commissioned on 1 December 1933 with Lieutenant Commander Merril Comstock in command. Cachalot was the first submarine to have the Torpedo Data Computer, Arma Corporation's Mark 1, installed.