sentences:  Upon completion of conversion, she was assigned to the Harbor Defense Unit, Port Townsend, Washington, where she remained until April 1955.With the designation MHC-47 effective 7 February 1955, "Merganser" conducted underwater sound tests at Carr Inlet Acoustics Range in Washington for the first 2 weeks in April and then got underway for duty with the 11th Naval District at San Diego, California.There, until February 1958, she provided target towing and sonar training services, conducted harbor defense exercises, and performed search and rescue missions.