ARL-20
Displacement 4,100
Length 328'
Beam 50'
Draw 14'
Speed 12 k
Complement 253
Armament 8 40mm
Class Achelous

LST-1115 was laid down by the Chicago Bridge and Iron Co., Seneca, Ill., 29 September 1944; launched 22 December 1944; and placed in reduced commission 4 January 1945. Proceeding to Baltimore, Md., she decommissioned 6 February 1945, underwent conversion; and was commissioned in full as Pentheus (ARL 20), 7 June 1945, Lt. Mason E. Brock USNR, in command.

Following shakedown in Chesapeake Bay, Pentheus took on pontoons at Providence, R.I., and on 15 July got underway for the Canal Zone. Crossing into the Pacific, 26 July, she steamed on to Subic Bay, Philippines. Arriving 17 October, she engaged in repair work there until sailing for Pearl Harbor, 5 January 1946. From Pearl Harbor, she steamed to Johnston Island for 2 weeks duty prior to getting underway for Green Cove Springs, Fla., and inactivation. Arriving 20 April, she decommissioned and joined the Atlantic Reserve Fleet, where she remained until struck from the Navy List, 1 January 1960. She was sold, 13 June 1960, to Ships, Inc. of Florida.