On 11 March 1945, following further exercises and training at San Diego, LCI(L)-1098 got underway for Pearl Harbor, Hawaii, en route to Guam in the Marianas.

She was assigned harbor patrol and escort duties in the Marianas on 25 April and remained so engaged until 16 December, when she sailed back toward the United States.

Over the next 18 months, Sparrow operated along the east coast of the United States, from Key West, to New London, Connecticut.

On 7 February 1955, Sparrow was redesignated a coastal mine hunter, MHC-42, and on 12 April, she was placed in commission, in reserve, at Charleston.

In July 1958, Sparrow moved to Mayport, Florida; and, on 1 January 1960, her name was struck from the Navy list.