USS Emeline (SP-175) was a yacht acquired by the U.S. Navy during World War I. She was outfitted with military equipment, including 3-inch guns, and was commissioned as a patrol craft, assigned to protect shipping in the North Atlantic Ocean. She saved the lives of survivors of shipwrecks, and provided escort protection from German submarines for commercial ships. Post-war she was sold to the highest bidder, who had the yacht sail to San Diego, California, for delivery.