PGM-9 was the lead ship of 24 patrol gunboats built for the US Navy from 1944–45. The PGM-9 class was based on the hull of the PC-461-class submarine chaser and was designed as a replacement for the PGM-1-class gunboat to serve as a support vessel for PT boats. However, due to their relatively slow speed, the class failed to fulfil its intended purpose and was later reassigned to the minesweeper role instead.

As for PGM-9, she was originally laid down as the submarine chaser PC-1548 on 19 December 1943 at the Consolidated Shipbuilding yard in New York, launched on 13 February 1944, and commissioned on 1 July that year. She was later converted into a gunboat and received the "PGM-9" designation on 4 February 1944. During her short career of about a year and a half, PGM-9 served uneventfully in the Pacific theatre until 9 October 1945, when she was struck by Typhoon Louise and grounded on the Hirasone Reef off the coast of the Okinawa Islands. Deemed unrecoverable, she was decommissioned on 10 December 1945 and scrapped in situ.

PGM-9 was introduced in Update 2.51 "Spearhead". As an up-gunned derivative of USS Carmi (PC-466), PGM-9 features substantial improvements in terms of firepower. With a large number of autocannons, PGM-9 can deliver considerable damage against any simple-model vessels it encounters. However, as it commonly faces early destroyers and detailed-model ships, PGM-9’s armament often struggles to inflict significant damage against them. This is compounded by its simple damage model, which makes it extremely vulnerable to autocannons or large-calibre guns.