[1] From 20 September 1943, Cony patrolled through the Solomons, and from 1 to 3 October joined in a sweep against Japanese barges attempting to evacuate Kolombangara.

[1] Returning to Port Purvis 27 March 1944, Cony patrolled along the southwest coast of Bougainville, hunting Japanese barges and submarines, and giving fire support to troops ashore in the Empress Augusta Bay area.

She sailed from Port Purvis 4 May for Majuro and Pearl Harbor, where she joined the screen of a transport group bound for Eniwetok and the Saipan landings on 15 June.

Cony screened the transports as they unloaded and carried out antisubmarine patrol until 14 July, when she sailed to replenish at Eniwetok.

She screened carriers as they launched air raids supporting the landings on Peleliu between 15 and 30 September, then put into Manus to replenish.

As Japanese forces entered Leyte Gulf on 24 October to begin the Battle of Surigao Strait phase of the epic Battle for Leyte Gulf, Cony took her station with the battleships and cruisers in the battleline, joining in the furious firing of the night action, and pursuing and constantly dueling with Japanese destroyer Asagumo, finally sunk in the morning of 25 October with the aid of fire from another destroyer and two cruisers.

[1] Cony arrived at Manus 23 December 1944 and sailed 8 days later to screen transports to the Lingayen Gulf landings on 9 January 1945.

Through August, she made an escort voyage between Leyte and Ulithi, and on 8 September, arrived in the approaches of the Yangtze River to act as navigational ship during minesweeping operations.

[1] Reclassified DDE-508 on 26 March 1949, Cony was converted to an escort destroyer, specially equipped for antisubmarine warfare, and recommissioned 17 November 1949.

Cony joined Task Force Alfa, an experimental tactical group concentrating on antisubmarine warfare, in its operations along the east coast.