Former name retained.
(AM: t. 450; l. 143'; b. 28'; dr. 14'10"; s. 11 k.; cpl. 28; a. 1 3")
Dreadnaught (No. 1951) was built in 1917 by Union Iron Works, San Francisco, Calif.; purchased by the Navy 17 May 1917; outfitted at Mare Island Navy Yard; and commissioned 31 January 1918, Lieutenant J. J. Carey, USNRF, in command.
Sailing from San Francisco 27 February 1918 Dread-naught delivered her tow of coal barges at Norfolk 18 April, and arrived at New London 22 April. She was assigned to Patrol Force, Atlantic Fleet, and sailed from New London 25 April to escort a convoy of submarine chasers to the Azores. On her return passage she aided in towing SS Luckenbach from the Azores to Bermuda and then towed Goliath (No. 1494) from Bermuda to New York, arriving 1 July. Between 6 September and 18 October she again escorted a group of submarine chasers from New London to the Azores. Six days later she departed with a third convoy to the Azores, then sailed on to Brest, France, as escort for the Army tug Cuba, arriving 29 November.
Dreadnaught operated on harbor duty at Brest and towed barges and ships between Brest, L'Orient, and Bordeaux until 20 March 1919 when she got underway to escort a convoy of submarine chasers by way of Lisbon, Portugal, to Bermuda. She returned to Ponta Delgada, Azores, 11 April for towing duty in the Azores until 29 July. Towing submarine chasers she returned to New York 19 August. On 30 August she sailed for Norfolk with barges in tow, arriving 2 days later for overhaul.
Dreadnaught left Norfolk 23 January 1920 for the west coast, arriving at Mare Island 15 March. She was overhauled, reclassified YT-34, and attached to the 12th Naval District for duty. On 14 March 1922 she was placed out of commission, continuing her duties in an "in-service" status. Her designation was changed to YNG-21 on 7 October 1940, and in September 1944, she was stricken from the Navy List.