The new minesweeper departed for training at Mine Warfare School, Yorktown, Virginia, 30 June 1941; and reported for coastal duty with the Atlantic Fleet in July.

She subsequently performed these vital mine warfare functions at Bermuda and in the Caribbean until returning to Norfolk, Virginia for alterations and new sweeping gear on 3 February 1943.

She sailed for Norfolk, Virginia, 20 April 1944, and upon arrival took up duty as a towing ship for aircraft target practice offshore.

Jacamar remained on this duty, stationed at Hampton Roads, Virginia, until arriving New London, Connecticut, 10 February 1945.

After being briefly laid up in the Wando River, she was turned over to the Maritime Commission and sold in 1947 to O. R. Murphy, Charleston, S.C.