The Type 23 frigate or Duke class is a class of frigates built for the United Kingdom's Royal Navy. The ships are named after British Dukes, thus leading to the class being commonly known as the Duke class. The first Type 23, HMS Norfolk, was commissioned in 1989, and the sixteenth, HMS St Albans was commissioned in June 2002. They form the core of the Royal Navy's destroyer and frigate fleet and serve alongside the Type 45 destroyers. They were designed for anti-submarine warfare, but have been used for a range of uses. Eleven Type 23 frigates remain in service with the Royal Navy, with three vessels having been sold to the Chilean Navy, and one being retired in 2021, and a second one being retired in 2023.
HMAS Darwin, named for the capital city of the Northern Territory, was an Adelaide-class guided-missile frigate, formerly in service with the Royal Australian Navy (RAN). One of four ships ordered from the United States, Darwin entered service in 1984. During her career, she has operated in the Persian Gulf, as part of the INTERFET peacekeeping taskforce, and off the Solomon Islands. The frigate underwent a major upgrade during 2007 and 2008. She was decommissioned on 9 December 2017 and was supposed to be scuttled as a dive wreck in Tasmania, but the deal was pulled by the Tasmanian Government and her fate remains uncertain.
HMAS Newcastle, named for the city of Newcastle, New South Wales, the largest provincial city in Australia, was an Adelaide-class guided-missile frigate. The last ship of the class to be constructed, Newcastle entered service with the Royal Australian Navy in 1993. During her career, the frigate has operated as part of the INTERFET peacekeeping taskforce, served in the Persian Gulf, and responded to the 2006 Fijian coup d'état. The frigate was decommissioned on 30 June 2019 and transferred to the Chilean Navy on 15 April 2020 and renamed as Capitán Prat.
HMAS Onslow is one of six Oberon-class submarines, previously operated by the Royal Australian Navy (RAN). The submarine was named after the town of Onslow, Western Australia, and Sir Alexander Onslow, with the boat's motto and badge derived from Onslow's family heritage. Ordered in 1963, Onslow was laid down at the end of 1967 by Scotts Shipbuilding and Engineering Company in Scotland, launched almost a year later, and commissioned into the RAN at the end of 1969.
The Oberon class was a ship class of 27 British-designed submarines operated by five nations. They were designed as a follow-on from the Porpoise class; physical dimensions were the same but stronger materials were used in hull construction and improved equipment was fitted.
HMS Onyx was an Oberon class submarine of the Royal Navy.
HMS Ariadne was a Leander-class frigate of the Royal Navy. She was launched in 1971, was sold to Chile in 1992 and sunk as a target hulk in 2004.
HMS Danae was a Leander-class frigate of the Royal Navy. She was, like the rest of the class, named after a figure of mythology. Danae was built by Devonport Dockyard. She was launched on 31 October 1965 and commissioned on 10 October 1967.
HMAS Adelaide was the lead ship of the Adelaide class of guided missile frigates built for the Royal Australian Navy (RAN), based on the United States Navy's Oliver Hazard Perry-class frigates. She was built in the United States and commissioned into the RAN in 1980.
HMAS Sydney was an Adelaide-class guided-missile frigate of the Royal Australian Navy (RAN). The frigate was one of six modified Oliver Hazard Perry-class frigates ordered from 1977 onwards, and the third of four to be constructed in the United States of America. Laid down and launched in 1980, Sydney was named for the capital city of New South Wales, and commissioned into the RAN in 1983.
HMAS Melbourne was an Adelaide-class guided-missile frigate of the Royal Australian Navy, which entered service in 1992. Melbourne has been deployed to the Persian Gulf on several occasions, and served as part of the INTERFET peacekeeping taskforce in 2000. On 26 October 2019, Melbourne was decommissioned from the RAN, subsequently being transferred to Chile. The ship was commissioned into the Chilean Navy as Almirante Latorre on 15 April 2020.
HMAS Canberra was an Adelaide class guided missile frigate of the Royal Australian Navy (RAN). Based on the Oliver Hazard Perry class design, Canberra was one of four Adelaide class ships constructed in the United States of America, and one of six to serve in the RAN.
HMS Sealion (S07) was a Porpoise-class submarine.
HMS Opportune (S20) was an Oberon-class submarine of the Royal Navy.
The Adelaide class of six guided missile frigates was constructed in Australia and the United States for service in the Royal Australian Navy. Two were later sold to the Chilean Navy. The Adelaide class was based on the United States Navy's Oliver Hazard Perry-class frigates, but modified for Australian requirements. The first four vessels were built in the United States, and the final two were constructed in Australia. The first ship entered service in November 1980.
The Perth-class destroyers were three modified Charles F. Adams-class guided missile destroyers operated by the Royal Australian Navy (RAN). Ordered from Defoe Shipbuilding Company during 1962 and 1963, HMA Ships Perth, Hobart, and Brisbane were the first guided missiled-armed warships, and the first naval ships of United States design, to enter service with the RAN. All three ships operated during the Vietnam War, while Brisbane also participated in the Gulf War. The class was decommissioned between 1999 and 2001, with all three vessels later sunk as dive wrecks.
Brazilian submarine Humaitá (S20) was an Oberon-class submarine in the Brazilian Navy.
Tonelero (S21) was an Oberon-class submarine in the Brazilian Navy.
The Chilean submarine O'Brien was an Oberon-class submarine in the Chilean Navy.
Chile
