The USS Porpoise (SP-4) was a patrol yacht employed by the United States Navy during World War I. Originally built in 1910 by Oscar Anderson in South Norwalk, Connecticut, the vessel was initially named Casilda. It was constructed for Stewart H. Elliott of Norwalk. In 1914, the yacht was acquired by Ogden M. Reid of New York City, who renamed her Porpoise. The vessel served as a patrol yacht from 1917, when the Navy acquired her, until January 27, 1919, shortly after the end of World War I. As a patrol vessel, USS Porpoise was part of the U.S. Navy's efforts to safeguard maritime interests during wartime, though specific details of her service record and notable missions are not provided in the available documentation. The ship’s specifications, including size, armament, or technical features, are not detailed in the source. However, her role as a patrol yacht indicates she was likely a private yacht adapted for naval patrol duties, a common practice during wartime to quickly augment the fleet's capabilities. Her call sign in 1919 was Love - Boy - Jig - Sail, reflecting her naval communications identifiers during her service period. After her decommissioning and return to her owner in early 1919, she ceased her military duties. In summary, USS Porpoise (SP-4) was a privately built yacht repurposed for naval patrol duties during World War I. Her construction, ownership history, and brief service period highlight her role as part of the Navy's wartime auxiliary fleet, though detailed records of her operations remain scarce.

This description has been generated using GPT-4.1-NANO based on the Vessel's wikidata information and then modified by ShipIndex.org staff.