The 54-foot motor pleasure boat Boomerang II was built at City Island, New York, in 1916. Later renamed Raazoo, she was leased by the Navy in June 1917 and commissioned as USS Raazoo (SP-508) in July. During World War I she served as a patrol craft in the New York City area and as an experimental vessel attached to the Naval Air Stations at Rockaway and Montauk Point. She was returned to her owner in May 1919.