USS Sparrow (AMc-31) should not be confused with USS Sparrow II.
The purse seiner Pacific was acquired by the Navy on November 14, 1940 at San Diego, California. Fifteen days later, she was assigned the name Sparrow, and designated a coastal minesweeper, AMC-31.
On December 12, 1940, she was reclassified as a harbor tug, and the name Sparrow was cancelled. On February 5, 1941, she was named Marin, and redesignated a net tender, YN-53.