Towards the end of the European war, Muir operated with Task Force 63 which stymied the German U-boats' final thrust against Allied shipping in the North Atlantic.

On 17 May Muir joined Sutton (DE-771) in escorting under guard publicized U-234, with high ranking Luftwaffe officers and men German civilian technicians on board, to Portsmouth, New Hampshire, arriving two days later.

After visiting Houston, Texas, for Navy Day on 27 October, she devoted November and December to a cruise testing "SOFAR," a new long-range air sea rescue method.

She traveled 7,500 miles in the Atlantic dropping bombs for naval ships in the Bahamas to pick up the sound waves and plot the position of the destroyer escort as far away as Dakar, French West Africa (now Senegal).

In September 1947 she decommissioned and entered the Atlantic Reserve Fleet at Green Cove Springs, Florida, until 2 February 1956 when she was delivered on loan under the Military Assistance Program to the Republic of Korea at Boston Naval Shipyard.