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HMAS Choules at Fleet Base East Sydney Harbour, Australia in August 2014
History
United Kingdom
NameLargs Bay
NamesakeLargs Bay
Ordered18 December 2000
BuilderSwan Hunter, Wallsend, Tyne and Wear, England
Laid down28 January 2002
Launched18 July 2003
In service28 November 2006
Out of serviceApril 2011
Identification
FateDecommissioned under SDSR, sold to Australia
Australia
NameChoules
NamesakeChief Petty Officer Claude Choules
Acquired6 April 2011
Commissioned13 December 2011
Home portFleet Base East
Identification
Motto"Face Difficulty With Zeal"
StatusActive as of 2022
BadgeShip's badge
General characteristics
Class & typeBay-class landing ship dock
Displacement
  • 16,160 t (15,905 long tons) full load (RFA)
  • 16,190 t (15,934 long tons) (RAN)
Length579.4 ft (176.6 m)
Beam86.6 ft (26.4 m)
Draught19 ft (5.8 m)
Propulsion
  • 2 × Wärtsilä 8L26 generators, 6,000 hp (4.5 MW)
  • 2 × Wärtsilä 12V26 generators, 9,000 hp (6.7 MW)
  • 2 × propulsion pods
  • 1 × bow thruster
Speed18 knots (33 km/h; 21 mph)
Range8,000 nmi (15,000 km; 9,200 mi) at 15 kn (28 km/h; 17 mph)
Boats & landing
craft carried
Capacity
Troops356 standard or 700 overload
Complement
  • RFA: 60-70 core, increased for operational deployments
  • RAN - 158 fully crewed
Sensors &
processing systems
  • RAN service:
  • EID ICCS integrated communications control system
  • CEAFAR-S multi-function radar
Armament
Aircraft carriedBlackhawk and Seahawk helicopters frequently embarked;[3] flight deck can operate helicopters up to Chinook size
Aviation facilitiesNo permanent hangar; temporary hangar can be fitted.

HMAS Choules (L100) is a Bay-class landing ship that served with the Royal Fleet Auxiliary (RFA) from 2006 to 2011, before being purchased by the Royal Australian Navy (RAN). The vessel was built as RFA Largs Bay by Swan Hunter in Wallsend, Tyne and Wear. She was named after Largs Bay in Ayrshire, Scotland, and entered service in November 2006. During her career with the RFA, Largs Bay served as the British ship assigned to patrol the Falkland Islands in 2008, and delivered relief supplies following the 2010 Haiti earthquake.

At the end of 2010, Largs Bay was marked as one of the vessels to be removed from service under the Strategic Defence and Security Review. She was offered for sale, with the RAN announced as the successful bidder in April 2011. After modifications to make her more suited for Australian operating conditions, the vessel was commissioned in December 2011 as HMAS Choules, named after Royal Navy and Royal Australian Navy Chief Petty Officer Claude Choules. A propulsion transformer failure kept the ship out of service between July 2012 and April 2013.

Design and construction

[edit]
Main article: Bay-class landing ship dock

The Bay class was designed as a replacement for the Round Table-class logistics ships operated by the RFA.[4] The new design was based on the Royal Schelde Enforcer design; a joint project between the Dutch and Spanish resulting in the Rotterdam-class and Galicia-class amphibious warfare ships.[4] The main difference with the British ships is the lack of a helicopter hangar.[5] The ships were originally designated "auxiliary landing ship logistics" or ALSL, but this was changed in 2002 to "landing ship dock (auxiliary)" or LSD(A), better reflecting their operational role.[6] Four ships were ordered; two from Swan Hunter, and two from BAE Systems Naval Ships.[4]

The Bay-class ships have a full load displacement of 16,160 tonnes (15,900 long tons) in RFA service; this increased slightly to 16,190 tonnes (15,930 long tons) after modifications for RAN service.[4][7] Largs Bay/Choules is 579.4 feet (176.6 m) long, with a beam of 86.6 feet (26.4 m), and a draught of 19 feet (5.8 m).[4] Propulsion power is provided by two Wärtsilä 8L26 generators, providing 6,000 horsepower (4.5 MW), and two Wärtsilä 12V26 generators, providing 9,000 horsepower (6.7 MW).[4] These are used to drive two steerable propulsion pods, with a bow thruster supplementing.[4] Maximum speed is 18 knots (33 km/h; 21 mph), and the Bay-class ships can achieve a range of 8,000 nautical miles (15,000 km; 9,200 mi) at 15 knots (28 km/h; 17 mph).[4] Largs Bay was fitted for but not with a Phalanx CIWS and a 30mm DS30B cannon when required for self defence.[8] The RAN's webpage for Choules does not specify any armament.[7] In British service, the everyday ship's company consisted of 60 to 70 RFA personnel, with this number supplemented by members of the British Armed Forces when Largs Bay was deployed operationally.[4][9][10] The RAN opted to maintain the ship at full operational crewing at all times, with a ship's company of 158, including 22 Army and 6 RAAF personnel.[9][11]

RFA Largs Bay in Portland Harbour, August 2009

As a sealift ship, Largs Bay is capable of carrying up to 1,150 linear metres of vehicles; equivalent to 24 Challenger 2 tanks, 32 M1A1 Abrams tanks, or 150 light trucks.[4][7] The cargo capacity is equivalent of 200 tons of ammunition, or 24 twenty-foot equivalent unit containers.[4] During normal conditions, a Bay-class ship can carry 356 soldiers, but this can be almost doubled to 700 in overload conditions.[4] The ship does not have permanent hangar facilities. However, a temporary hangar may be fitted and in Australian service the twin-spot flight deck has been extensively utilized with the embarkation of Blackhawk, MRH-90 and Seahawk helicopters. In the period one year prior to April 2014 the ship had clocked up 1,000 deck landings.[12] The flight deck is capable of accommodating helicopters up to the size of a Chinook heavy-lift helicopter.[4][6][13] The well dock can carry one LCU Mark 10, one LCM-8, or two LCVPs (either the Royal Marines version or the Royal Australian Navy version), and two Mexeflotes can be suspended from the ship's flanks.[4][6][7] The LCM-1E landing craft being acquired by the RAN will not fit into the dock.[11] Two 30-ton cranes are fitted between the superstructure and the flight deck.[4]

Largs Bay and sister ship Lyme Bay were ordered from Swan Hunter on 18 December 2000.[4] Largs Bay was laid down at Swan Hunter's shipyard at Wallsend, Tyne and Wear on 28 January 2002; the first ship of the class work started on.[4] The ship was launched on 18 July 2003.[4] The ship was completed and accepted by the Ministry of Defence in April 2006, over a year late.[14] Largs Bay was dedicated on 28 November 2006, the second of the class to enter service with the RFA.[4] The Bay-class construction project saw major delays and cost overruns, particularly in the Swan Hunter half of the project.[14] Shortly after Largs Bay was handed over, Swan Hunter was stripped from the project, with BAE taking full responsibility for the class and Lyme Bay towed to BAE's shipyard in Govan for completion in June 2006.[14]

Operational history

[edit]

United Kingdom

[edit]
Humanitarian supplies being unloaded from Largs Bay in Haiti

Four months after entering service, an engine room fire resulted in steering and propulsion issues, requiring Largs Bay to be towed to Plymouth for repairs.[15] In late November 2007, Largs Bay embarked 815 Naval Air Squadron 215 Flight and left home waters for the Caribbean to conduct counter-drug operations.[16] She visited eleven islands including Barbados, Curaçao, Grand Turk, Martinique, Trinidad and also the USA.[16] Three days after leaving Barbados Largs Bay's patrolling helicopter spotted a small fishing vessel stopped in the water and detained her after a pursuit; 575 kilograms (1,268 lb) of cocaine were recovered, with an estimated £20 million European street value.[16] She participated in Navy Days while in port at Curaçao, where several hundred people toured her.[16]

In late 2008, it was reported that Largs Bay was to replace HMS Northumberland for duties in the Falkland Islands. Northumberland was to have left for the Islands in December 2008, but was instead sent for pirate patrol off Somalia.[17]

In early 2010, Largs Bay was deployed to the Arctic Circle.[18] Following the 2010 Haiti earthquake, the ship was pulled from exercises and sailed on 3 February to deliver a load of relief supplies to Haiti.[18][19] On 18 February 2010, she arrived at Port-au-Prince and unloaded 430 tonnes (470 tons) of supplies plus 165 tonnes (182 tons) of rations, while engineers from the ship began work on restoring electricity ashore.[18][20] On 30 March 2010, she returned home.[21] Largs Bay's actions were recognised in December 2011 with the awarding of the Firmin Sword of Peace.[18]

In August 2010, the ship participated in the Bournemouth Air Festival.[22]

Decommissioning and transfer

[edit]
Largs Bay in Falmouth Docks during August 2011. Note that her new RAN pennant number has been painted on her hull.

In December 2010, it was announced that the ship would be decommissioned in April 2011 as part of the Strategic Defence and Security Review.[23][24] Shortly after marking Largs Bay for disposal, the British Ministry of Defence contacted the Chilean government and suggested the vessel as a potential replacement for the landing ship tank vessel Valdivia, which was due to leave service.[25] In January 2011, the Australian Department of Defence announced that it was interested in purchasing the vessel for the RAN as a replacement for the heavy landing ship HMAS Tobruk or one of the Kanimbla-class amphibious warfare ships.[24][26] Interest in the ship was also shown by Brazil and India.[27]

On 17 March 2011, the Australian Department of Defence announced that the RAN would be bidding for Largs Bay; this was followed on 6 April by news that a £65 million (A$100 million) bid had been successful.[28][29] Sea trials during April showed that the ship was in good condition, although she would have to be modified before entering Australian service, particularly to allow operation in tropical conditions.[30] During a 16-week docking at the A&P Group shipyard in Falmouth, the modifications were made, along with refit work to maintain the ship's Lloyds certification.[9] The RAN also acquired two Mexeflote landing rafts for use with the ship.[31]

On 13 August, it was announced that Largs Bay would be renamed HMAS Choules when commissioned into the RAN.[32] The name comes from Chief Petty Officer Claude Choules, who served in both the Royal Navy and the RAN during his career, and was the last known living participant in World War I.[32][33] Choules is the second RAN vessel to be named after an enlisted sailor, following the submarine HMAS Sheean.[34] The ship was assigned the pennant number L100, reflecting the 100th anniversary of the RAN's origin in 2011.[33] Her motto is "Face Difficulty With Zeal".[35]

On 14 October, the vessel was handed over to the RAN.[36] She arrived in Fremantle, Western Australia on 10 December, and was commissioned into the RAN on 13 December.[37][38] Choules entered full operational service in early 2012, and is based at Fleet Base East.[31][35]

Australia

[edit]
HMAS Choules at Fleet Base East in January 2012. The ship's temporary hangar structure is visible behind the superstructure.

On 24 February 2012, Choules arrived in Townsville.[39] This was in preparation for a month of amphibious warfare training exercises with the Australian Army's 3rd Brigade.[39]

In June 2012, one of the two main electrical transformers involved in the ship's propulsion system failed, after an earlier engineers report highlighted "overheating of the propulsion motors and transformers".[15][40] Inspection found that insulation failure had short-circuited the transformer, while other transformers aboard showed premature wear.[40] Unable to find an available spare, a new unit had to be ordered from the manufacturer.[15] In June, it was predicted that Choules would be out of service for four to five months, but by October, claims were made that the ship would be inoperable until at least January 2013, and if all of the wear-showing transformers were replaced, she would not return to service until April 2013.[15][40] By December, the faulty transformer had been replaced, and the RAN had decided that although the other transformers (propulsion and others) had been shown to have acceptable levels of wear, all would be replaced before Choules was reactivated.[41] These repairs were completed in early 2013, and the ship was assessed as ready to re-enter service on 12 April.[42]

For a short time from July 2013, Choules was anchored offshore of the Manus Regional Processing Centre in Papua New Guinea to provide temporary accommodation for Department of Immigration and other personnel, due to a lack of accommodation at the centre.[43] In April 2015, the ship transported 46 Vietnamese asylum seekers back to Vũng Tàu, after their vessel was intercepted at sea on 20 March by Australian border protection units and their claims were rejected after interviews at sea lasting less than 40 minutes.[44][45]

Choules' operational role was reevaluated after the Canberra-class landing helicopter dock ships entered service in 2016, but will likely be kept on to fill the role of the strategic sealift ship envisioned by the 2009 Defence white paper.[11][46]

In March 2017 Choules was sent to Queensland to support recovery after Cyclone Debbie.[47]

Choules was deployed to Vanuatu on 30 September 2017 to aid in the rescue of 11,000 people from a volcanic eruption of Monaro Voui.[citation needed]

In January 2020, Choules was deployed to the coastal town of Mallacoota in East Gippsland, Victoria, to evacuate thousands of people trapped by bushfires and to ferry them south to Hastings in Western Port Bay.[48][49][50]

On 14 February 2021, HMAS Choules left Australia for Papua New Guinea with 5 Isuzu fire trucks donated by Queensland Fire and Emergency Services.[51]

On 11 March 2021, Gippsland officially announced Mallacoota as the new ceremonial homeport for HMAS Choules.[52]

Choules underwent a major refit between 2020 - 2021 as part of SEA3030-2 Capability Assurance Project, Mid-Life Upgrade (CAP) by A&P Australia.[53]

In May 2022 it was announced that Choules would be eventually replaced by one of two sought 'Joint Support Ships' under Project Sea 2200.[54]

In early 2024 it was revealed that Choules had been fitted with a new CEA Technologies radar.[55]

Citations

[edit]
  1. ^ "The future of Phalanx in the RAN - Australian Defence Magazine".
  2. ^ "New South Wales Section - Royal Institution of Naval Architects - RINA". 16 August 2023.
  3. ^ "HMAS Choules".
  4. ^ a b c d e f g h i j k l m n o p q r s Saunders (ed.), Jane's Fighting Ships 2008–2009, p. 876
  5. ^ Kemp, New UK landing ship takes to the water
  6. ^ a b c Scott, The Royal Navy's Future Fleet
  7. ^ a b c d Royal Australian Navy. "HMAS Choules". www.navy.gov.au. Retrieved 20 March 2022.
  8. ^ Royal Navy, RFA Largs Bay
  9. ^ a b c Kerr, Amphibious ambitions
  10. ^ Johnson, Ian (4 February 2010). "RFA Largs Bay Haiti Diary". Royal Navy. Archived from the original on 6 April 2010. Retrieved 12 July 2012.
  11. ^ a b c Gillett, Australia's Navy, Part 2, p. 22
  12. ^ Missing Title (PDF) (Report). Australian Navy. Archived from the original (PDF) on 4 March 2018.
  13. ^ Scott, Sweating the asset: versatility is the key to LSD(A) multi-tasking
  14. ^ a b c Brown, UK strips Swan Hunter of LSD(A) role
  15. ^ a b c d McPhedran, Missing spare part grounds Navy ship
  16. ^ a b c d Royal Navy, 815 Naval Air Squadron in RFA Largs Bay
  17. ^ UPI, Britain withdraws warship from Falklands
  18. ^ a b c d Craig, Royal Fleet Auxiliary ship Largs Bay wins award
  19. ^ BBC News, RFA Largs Bay leaves Southampton bound for Haiti
  20. ^ Daily Express, Royal Navy aid ship reaches Haiti
  21. ^ The News, RFA Largs Bay returns home after earthquake aid mission
  22. ^ Bournemouth Echo, RFA Largs Bay sails in for Bournemouth Air Festival
  23. ^ Defence News, Changes to Royal Navy's surface fleet announced
  24. ^ a b 'Themistocles', The UK SDSR and JP 2048 Phase 4C – A Golden Opportunity
  25. ^ Higueras, Chile eyes new amphibious transport ship
  26. ^ Oakes, Navy eyes redundant UK vessel
  27. ^ Kerr, Australia completes Largs Bay purchase
  28. ^ Taylor, Australia to buy amphibious military transport ship, aircraft
  29. ^ Australian Associated Press, Australia to buy used UK landing ship
  30. ^ Flash Traffic: Purchase of Largs Bay, in The Navy
  31. ^ a b Royal Australian Navy, HMAS Choules commissioned
  32. ^ a b Moulton & Australian Associated Press, Naval ship named after WA war veteran Claude Choules
  33. ^ a b Griggs, Naming of Ex RFA Largs Bay - HMAS Choules
  34. ^ Royal Australian Navy, HMAS Sheean
  35. ^ a b O'Callaghan, Choules on her way
  36. ^ Dodd, Navy's borrowed ship costs us $82,000 a day
  37. ^ Sea Waves, Port Visits December 2011
  38. ^ Australian Broadcasting Corporation, HMAS Choules commissioned in honour of veteran
  39. ^ a b Timms, Newest Navy warship heads north
  40. ^ a b c Australian Associated Press (17 October 2012). "Navy unclear why $100m ship broke down". smh.com.au (The Sydney Morning Herald). Retrieved 17 October 2012.
  41. ^ "In Brief: Work on Choules". Navy News. Directorate of Defence News. 6 December 2012. pp. 6–7.
  42. ^ West, Sarah. "HMAS Choules returns to sea". Royal Australian Navy. Retrieved 12 April 2013.
  43. ^ "Robert Cornall AO, Review into the events of 16-17 February 2014 at the Manus Regional Processing Centre, 23 May 2014" (PDF). Archived from the original (PDF) on 29 May 2014. Retrieved 29 May 2014.
  44. ^ Aston, Heath (17 April 2015). "Australian Navy to hand 50 asylum seekers back to Vietnam". The Canberra Times. Archived from the original on 18 April 2015. Retrieved 28 May 2015.
  45. ^ "Úc bị chỉ trích vì từ chối cho 46 thuyền nhân Việt Nam tị nạn". Nguoi Viet Daily News (in Vietnamese). 27 May 2015. Archived from the original on 28 May 2015. Retrieved 28 May 2015.
  46. ^ Department of Defence, Defending Australia in the Asia Pacific Century, p. 73
  47. ^ Andrew Greene (28 March 2017). "Navy's largest ships unable to join Cyclone Debbie emergency response amid engine troubles". Australian Broadcasting Corporation. Retrieved 28 March 2017.
  48. ^ @LindaReynoldsWA (31 December 2019). "I've spoken with @ScottMorrisonMP & authorised #ADF to deploy extra assets to the Victorian fires: 3 helicopters & 1 aircraft will fly to East Sale; HMAS Choules & MV Sycamore will sail to East Gippsland. A Joint Task Force has been stood up with Army personnel & Liason [sic] Officers" (Tweet) – via Twitter.
  49. ^ Donovan, Samantha (3 January 2020). "Thousands ferried out to HMAS Choules". ABC Radio. Retrieved 3 January 2020.
  50. ^ Royall, Ian; Simonis, Aneeka; Travers, Brianna; McArthur, Grant (2 January 2020). "'Leave high risk areas now': Warning ahead of hot weekend". The Advertiser. Retrieved 2 January 2020.
  51. ^ "Untitled". Archived from the original on 24 December 2021.
  52. ^ Archived at Ghostarchive and the Wayback Machine: "HMAS Choules honoured as Mallacoota named ceremonial homeport". YouTube. 10 March 2021.
  53. ^ "10 Years of Supporting HMAS Choules".
  54. ^ "Indo Pacific 2022: BMT positions ELLIDA design for Australia's SEA 2200 programme". Janes.com. 11 May 2022. Retrieved 12 August 2022.
  55. ^ "HMAS Choules fitted with CEAFAR radar - Australian Defence Magazine". www.australiandefence.com.au. Retrieved 15 March 2024.

References

[edit]
[edit]
Revisions and contributorsEdit on WikipediaRead on Wikipedia

HMAS Choules

View on Grokipedia
from Grokipedia
HMAS Choules (L100) is a Bay-class landing ship dock operated by the Royal Australian Navy for amphibious warfare, troop transport, and humanitarian assistance missions.[1]
Commissioned into service on 13 December 2011 following acquisition from the United Kingdom, the vessel was originally constructed as RFA Largs Bay (L3006) for the Royal Fleet Auxiliary, entering UK service in 2006 after prior involvement in disaster relief efforts such as the 2010 Haiti earthquake response.[2][1]
Named in honour of Chief Petty Officer Claude Choules, Australia's last surviving combat veteran of both World Wars who served until age 80 and died in 2011 at 110, the ship displaces 16,190 tonnes, measures 176 metres in length, and accommodates a crew of 158 with capacity for over 350 troops, 32 main battle tanks, 150 light vehicles, two helicopters, and landing craft.[2][1][2]
Based at Fleet Base East in Sydney, Choules supports regional operations including equipment deliveries to Pacific allies, anti-submarine warfare exercises, and border security tasks, underscoring its versatility as a strategic sealift asset amid Australia's emphasis on Indo-Pacific maritime capabilities.[1][2][3]

Origins and Design

Development of the Bay Class

The Bay-class landing ship dock (LSD) design emerged from the UK's Alternative Landing Ship Logistic (ALSL) program, initiated to replace the aging Round Table-class logistics ships with vessels offering enhanced amphibious projection capabilities at reduced acquisition and operational costs.[4] Drawing directly from the Royal Schelde Enforcer concept—originally developed by the Dutch shipbuilder following the 1998 commissioning of HNLMS Rotterdam—the Bay class prioritized modular, cost-efficient construction suitable for expeditionary warfare, enabling rapid deployment of troops, vehicles, and supplies without the full complexity of dedicated warships.[5][4] This adaptation reflected the Royal Navy's post-Cold War shift toward flexible, NATO-interoperable sealift assets amid fiscal pressures, favoring mercantile-style builds with commercial certifications to leverage civilian shipyard efficiencies while incorporating military floodable docks and aviation facilities.[6] Central to the design's rationale was its dual-role emphasis on logistical sustainment and assault support, capable of transporting over 350 troops, 24 main battle tanks, or equivalent vehicle loads in 1,150 linear meters of deck space, alongside four landing craft and two helicopters.[4][7] The Enforcer-derived hull form, with its stern dock for mexeflote pontoons and roof-strengthened hangar, addressed causal requirements for over-the-beach operations in littoral environments, doubling the lift capacity of predecessors like the Sir Bedivere class while minimizing crew demands through automation and ro-pax ferry influences.[4] This approach stemmed from empirical assessments of expeditionary needs in resource-constrained scenarios, prioritizing interoperability with allied forces—such as US Marine Corps elements—over bespoke naval hardening, as evidenced by the vessels' certification as Class 1 passenger ships under civilian standards.[5] Budgetary realism drove the selection of the Enforcer baseline, as UK defense reviews in the late 1990s and early 2000s highlighted the impracticality of fully militarized designs amid declining fleet auxiliaries; the resulting specification balanced strategic lift for brigade-scale insertions with peacetime roles in humanitarian aid, ensuring viability under the Royal Fleet Auxiliary's civilian-manned model.[6] Engineering choices, including diesel-electric propulsion for endurance over 8,000 nautical miles, underscored first-principles focus on reliability and versatility rather than high-speed combat utility, aligning with causal analyses of modern conflicts favoring sustained projection over rapid assault.[4]

Technical Specifications and Capabilities

HMAS Choules measures 176 meters in length, with a beam of 26.4 meters and a draught of 5.8 meters.[1] The vessel has a full load displacement of 16,190 tonnes.[1] The ship employs a diesel-electric propulsion system, consisting of four Wärtsilä generators driving two azimuth thrusters and bow thrusters, achieving a maximum speed of 18 knots.[1] [8] It possesses an operational range of 15,000 kilometers at 15 knots, supporting extended deployments with provisions for fuel, ammunition, and logistics stores.[1] As a Bay-class landing ship dock, Choules features a floodable well deck for amphibious operations, accommodating two landing craft vehicles/personnel (LCVP) and facilitating the transfer of troops and vehicles to shore.[9] The vessel can embark over 300 troops, 23 M1A1 Abrams main battle tanks, and up to 150 light vehicles, providing substantial payload capacity relative to its propulsion output.[2] [9] It also supports helicopter operations, with deck space for two large rotorcraft such as CH-47 Chinooks.[10]
SpecificationDetail
Length176 m[1]
Beam26.4 m[1]
Draught5.8 m[1]
Displacement (full load)16,190 tonnes[1]
Speed18 knots[1]
Range15,000 km at 15 knots[1]
Troop CapacityOver 300[2]
Vehicle Capacity23 Abrams tanks, 150 light vehicles[9]
Landing Craft2 LCVP[10]
Helicopter Operations2 large rotorcraft[10]

Armament, Sensors, and Adaptations

HMAS Choules, originally configured as an auxiliary vessel in Royal Fleet Auxiliary service, featured light defensive armament limited to two 7.62 mm Mk.44 miniguns and six 7.62 mm L7 general-purpose machine guns, emphasizing its transport role over offensive capabilities.[11] Provisions existed for potential upgrades including a Phalanx close-in weapon system (CIWS) and 30 mm DS30B cannon, though these were not baseline installations.[11] Following transfer to the Royal Australian Navy in 2011, the ship's armament remained minimal to preserve amphibious lift capacity, with the primary addition being a single Phalanx CIWS mounted for short-range self-defense against missiles, aircraft, and small surface threats.[12] The Phalanx system operates autonomously via its integrated search-and-track radar, firing 20 mm tungsten rounds at up to 4,500 per minute to intercept inbound projectiles at ranges under 2 km.[12] No significant offensive weapons, such as missiles or main guns, were incorporated, aligning with its role in logistics and troop projection rather than direct combat.[1] Sensor adaptations have enhanced Choules' defensive posture and operational awareness. In early 2024, as part of the Capability Assurance Programme, four CEAFAR phased-array radar panels were installed on the bridge wings, replacing legacy systems for 360-degree, all-weather surveillance extending to air and surface contacts at long ranges.[12][13] Developed by CEA Technologies, the CEAFAR-S variant provides multi-function capabilities including air search, fire control, and electronic warfare support, enabling better coordination with RAN air defense assets despite the ship's limited weaponry.[12] This upgrade, completed during a mid-life refit, addresses vulnerabilities in contested environments by improving threat detection over the original RFA-era navigation radars.[12] Further adaptations support aviation and landing operations integral to combat support. The flight deck accommodates two medium-lift helicopters, such as the NHIndustries NH90 (MRH-90 in RAN service prior to retirement) or similar rotary-wing assets, with a 2020 addition of an AGI Jet Blast Deflector and visual landing aid system facilitating deck operations in varying conditions and future unmanned aerial vehicle integration.[14] The well dock supports two LCM-8 landing craft mechanized or multiple LCVPs for vehicle and personnel transfer, with adaptations ensuring compatibility under dynamic threat scenarios through integrated communications like the EID ICCS control system.[1] These modifications evolve Choules from a pure auxiliary into a more resilient platform for joint amphibious tasks, though without full combatant-level sensors or armament.[12]

Construction, Acquisition, and Commissioning

Building and Entry into UK Service

RFA Largs Bay (L3006), the lead ship of the Bay-class landing ship dock, was ordered on 18 December 2000 as part of the United Kingdom's procurement of four auxiliary amphibious vessels to replace the Round Table-class landing ship logistics under earlier defence planning emphasizing cost-effective sealift for expeditionary operations.[15][16] Her keel was laid down on 28 January 2002 at Swan Hunter's shipyard in Wallsend, Tyne and Wear, utilizing a mercantile hull design derived from commercial roll-on/roll-off ferries to minimize acquisition costs compared to fully militarized warships, though this approach later prompted internal Ministry of Defence assessments on potential vulnerabilities in contested environments due to limited compartmentalization and armor.[17][5] The vessel was launched on 18 July 2003, but construction faced delays from Swan Hunter's financial difficulties, with the yard incurring significant overruns before completing fit-out.[16][15] Following handover from Swan Hunter in April 2006, final outfitting and systems integration proceeded, enabling the ship to achieve contractual performance benchmarks during builder's sea trials, including a maximum speed of 18 knots and capacity for 1,150 lane meters of vehicle deck space alongside 350 troops or equivalent stores.[17][15] Largs Bay was formally commissioned into the Royal Fleet Auxiliary on 28 November 2006 at Portsmouth, entering service with a civilian-manned crew under the Ministry of Defence's auxiliary fleet structure, thereby providing the Royal Navy with enhanced amphibious projection capabilities at approximately half the unit cost of purpose-built assault ships.[16][15] Initial operational evaluations post-commissioning validated the diesel-electric propulsion system's reliability for sustained transoceanic voyages, underscoring the design's emphasis on logistical endurance over high-intensity combat survivability.[4]

Decommissioning from RFA and Transfer to Australia

The Royal Fleet Auxiliary vessel RFA Largs Bay was decommissioned on 30 April 2011 as part of broader reductions outlined in the UK's 2010 Strategic Defence and Security Review, which aimed to address fiscal pressures following the global financial crisis and ongoing commitments in Afghanistan by trimming amphibious capabilities.[18][19] Rather than scrapping the 2006-commissioned Bay-class landing ship dock, the Ministry of Defence opted to offer it for sale internationally to recoup value from an asset with significant remaining service life.[20] Australia's government announced the purchase of Largs Bay on 6 April 2011 for £65 million (approximately A$100 million at prevailing exchange rates), viewing it as a cost-effective interim solution to replace the decommissioned Kanimbla-class vessels HMAS Manoora and HMAS Kanimbla, which had suffered mechanical failures, thereby addressing an immediate shortfall in strategic sealift capacity until the arrival of the Canberra-class landing helicopter docks.[21][22] The acquisition aligned with Australia's need for enhanced amphibious projection in the Indo-Pacific region, enabling rapid deployment of troops, vehicles, and humanitarian aid without the delays and higher costs of new construction.[23] Prior to handover, the ship underwent modifications in the UK to meet Royal Australian Navy standards, including adaptations for tropical operations, and was formally transferred to the Australian Defence Force in October 2011 after successful sea trials.[2] The sale represented empirical value for Australia, securing a capable platform at roughly half its book value for urgent operational gaps, while the UK's disposal reflected pragmatic austerity measures prioritizing budget savings over retaining surplus hulls.[24][25]

Renaming and Commissioning in RAN

The Royal Australian Navy announced on 13 August 2011 that the acquired Bay-class landing ship, formerly RFA Largs Bay, would be renamed HMAS Choules (L100) in honor of Chief Petty Officer Claude Stanley Choules, the last known surviving combat veteran of the First World War from Australia.[26][27] Choules, born in England in 1901, enlisted in the Royal Navy at age 14 in 1915, participated in the Battle of Jutland aboard HMS Revenge, and later transferred to the RAN in 1926 after emigrating to Australia, serving a total of 40 years across both navies until retirement in 1957.[28] The naming recognized his dedicated service in peace and war, as well as the contributions of enlisted personnel, marking only the second RAN vessel named after a sailor rather than an officer or place.[26] Following a handover to the Australian Defence Force on 20 October 2011 in the United Kingdom—after sea trials and modifications including propulsion overhauls and tropicalization upgrades—the ship departed for Australia under RAN command.[29][1] Initially designated ADFS Choules during transit, it arrived in Fremantle, Western Australia, on 10 December 2011, demonstrating efficient transfer of a capable amphibious asset at a cost of A$100 million, avoiding delays in RAN sealift replacement needs.[30][1] HMAS Choules was formally commissioned into RAN service on 13 December 2011 in Fremantle, with initial crew familiarization and integration occurring en route and post-arrival to prepare for amphibious task group roles.[31][1] The vessel then transited eastward, berthing at Fleet Base East, Sydney—its designated homeport—on 21 December 2011, symbolizing the seamless administrative incorporation of British naval heritage into Australian defense capabilities.[32][1]

Operational History

Royal Fleet Auxiliary Service (2006–2011)

RFA Largs Bay entered service with the Royal Fleet Auxiliary on 17 December 2006, following construction by Swan Hunter.[16] Initially, the vessel conducted training and operational trials, including early Caribbean deployments where it supported counter-narcotics efforts by intercepting a boat carrying 1.125 tons of cocaine in December 2007.[33] In 2008, RFA Largs Bay undertook a patrol deployment to the Falkland Islands, providing logistical support and maintaining British presence in the South Atlantic amid ongoing sovereignty commitments.[15] The ship demonstrated its amphibious capabilities by transporting up to 350 troops and vehicles, along with operating helicopters such as the Merlin, which enhanced its role in sustaining power projection for overstretched UK forces during concurrent operations in Iraq and Afghanistan.[34] The vessel participated in NATO exercises in the Baltic Sea, where it operated alongside HMS Albion and was shadowed by Russian surveillance ships, underscoring its utility in multinational training to bolster alliance interoperability.[35] These activities, combined with routine sealift missions, accumulated significant operational time without major incidents, affirming the Bay-class design's robustness for diverse logistical demands.[36] A pivotal humanitarian deployment occurred in response to the 12 January 2010 Haiti earthquake; RFA Largs Bay sailed from the UK on 3 February loaded with vehicles, port-handling equipment, and corrugated iron sheeting, arriving to deliver hundreds of tonnes of aid and earning the Firmin Sword of Peace for its contributions.[37][38] This effort highlighted the ship's versatility in rapid crisis response, enabling the offload of supplies despite damaged infrastructure and supporting UK commitments to international disaster relief amid constrained naval resources.[39] Throughout its RFA tenure until October 2011, such deployments exemplified reliable sustainment of UK overseas engagements.[16]

Early Royal Australian Navy Operations (2011–2019)

Following its commissioning into the Royal Australian Navy on 13 December 2011, HMAS Choules achieved initial operational capability in early 2012, marking the RAN's first modern landing ship dock since the retirement of the older Kanimbla-class vessels. The ship, capable of transporting up to 350 troops, 24 main battle tanks, or equivalent vehicle loads alongside its 1,150-square-metre vehicle deck and floodable dock, underwent trials to validate these features in Australian waters.[2][1] In February 2012, Choules conducted its inaugural RAN deployment, arriving in Townsville, Queensland, on 24 February for a month-long period focused on amphibious integration and regional presence activities. This exercise included embarkation of Australian Army elements and testing of troop and equipment movements, demonstrating the ship's ability to rapidly offload forces via landing craft—capabilities that exceeded those of the RAN's prior amphibious assets, which had been progressively decommissioned due to age and maintenance issues. By March 2012, Choules had passed its first major amphibious capability assessment, successfully simulating insertion of land forces in northern Australian exercises.[40][34] Choules participated in Exercise Talisman Sabre 2013, a bilateral U.S.-Australia amphibious maneuver, where it supported joint operations including vehicle and troop offloads at Rockhampton, contributing to the validation of RAN amphibious doctrine amid the transition to larger landing helicopter dock capabilities. The ship repeated this role in Talisman Sabre 2015, operating alongside U.S. Navy amphibious ships to deliver Australian and U.S. Marines ashore during complex beach assaults at Fog Bay, Northern Territory, on 11 July, with operations emphasizing coordinated floodable dock usage for landing craft deployment. These exercises highlighted Choules' efficiency in handling mixed loads of up to 60 light vehicles or 16 heavy trucks, enabling sustained force projection without reliance on legacy platforms.[41][42] Throughout the period, Choules supported border protection under Operation Sovereign Borders, including in April 2015 when it transported 46 intercepted Vietnamese asylum seekers from Christmas Island back to Vung Tau, Vietnam, utilizing its capacity for secure personnel transit and small boat transfers. Additional regional patrols reinforced presence in the Indo-Pacific, building foundational experience in amphibious sustainment without extending to major humanitarian responses.[34]

Recent Deployments and Exercises (2020–Present)

In July 2024, HMAS Choules visited Apia, Samoa, where it conducted community engagements, including assisting with local construction projects and participating in friendly sports matches such as volleyball and touch football with the Samoa Police Service.[43][44] During this deployment and subsequent support for the Commonwealth Heads of Government Meeting (CHOGM) in October–November 2024, the ship provided accommodation for over 100 Pacific police personnel from 11 nations and facilitated their transport to shore via more than 290 small boat shuttles.[45][46] In April 2025, HMAS Choules deployed in support of Anti-Submarine Warfare Exercise (ASWEX), the Royal Australian Navy's largest such exercise in more than a decade, enhancing maritime capabilities in contested environments.[3] Later that year, in July, the vessel prepared for Exercise Talisman Sabre 2025 by embarking cargo in Townsville and conducting boat drills to maintain amphibious readiness for multinational operations.[47][48] From late August to September 2025, HMAS Choules anchored in Port Moresby, Papua New Guinea, to support Papua New Guinea Defence Force (PNGDF) Week commemorating the nation's 50th independence anniversary, hosting over 3,000 local visitors during a fleet open day and embarking PNGDF members along with personnel from Pacific partners for training and joint activities.[49][50] The deployment included a fleet review and facilitated shuttles for over 300 embarked personnel, underscoring the ship's role in regional presence missions amid southwest Pacific security dynamics.[51]

Upgrades and Sustainment

Mid-Life Refit and Capability Assurance (2020–2023)

HMAS Choules underwent a comprehensive mid-life refit from 2020 to 2021 under the SEA3030-2 Capability Assurance Project, executed by A&P Australia at Garden Island Dockyard in Sydney, marking the largest such effort at the facility in 15 years.[10] The project encompassed over 80 engineering changes across 44 capability areas, focusing on propulsion system sustainment, auxiliary electrical upgrades, and structural reinforcements to extend the vessel's service life beyond its original design parameters.[12] Key interventions included the removal and replacement of major equipment, necessitating six hull inserts each measuring approximately 3 meters by 5 meters during dry-docking, alongside renewals of the exhaust system, HVAC, and ballast water treatment systems.[10] The refit addressed age-related wear in critical systems, including propulsion and power distribution, through targeted overhauls that restored operational integrity without altering core amphibious configurations.[52] Valued at approximately $53 million for the core refit phase within a broader $180 million program, the work spanned 35 weeks of production activity, enabling the ship to resume full sealift duties post-completion in late 2021.[10] Subsequent capability assurance activities in 2023, culminating in Refit Period 21, finalized the four-year SEA3030-2 initiative by verifying system reliability and conducting sea trials, including first-of-class flight operations in March.[53][52] These enhancements improved overall sustainment, reducing vulnerability to downtime from legacy component failures compared to similar-aged Bay-class vessels, thereby assuring Choules' role in Australia's amphibious fleet through at least the mid-2030s.[10]

Ongoing Modifications and Reliability Enhancements

Following the completion of its mid-life refit in 2023, HMAS Choules received incremental upgrades to enhance operational flexibility and sustainment. In early 2024, the vessel was fitted with CEA Technologies' CEAFAR-S phased array radar system, installed in four mounts atop the forward superstructure to provide 360-degree surveillance coverage.[12][54] This integration improved situational awareness without necessitating full combat management system overhauls, allowing the ship to contribute to fleet deployment rotations amid broader RAN surface fleet constraints.[55] Sustainment efforts emphasized the reliability of the diesel-electric propulsion system, which has undergone routine overhauls of generators and azimuth thrusters to maintain efficiency and avoid the lubrication and fragment contamination issues observed in the integrated electric propulsion of larger RAN amphibious vessels like the Canberra-class LHDs.[1][56] Reverse osmosis (RO) desalination plants, upgraded during prior sustainment to produce potable water from seawater via high-pressure filtration, continued to support extended deployments, with engineering assessments ensuring compatibility for at-sea operations while adhering to port restrictions on usage.[57][10] For wharf-less access during amphibious tasks, Choules incorporated light landing craft (LLC) operations, exemplified by the July 2024 deployment where 23-meter LLCs transported over 200 personnel and equipment ashore without fixed infrastructure, enabling seamless support in remote Pacific locations.[58] These enhancements underscored the ship's high material availability, with post-maintenance sea trials in March 2023 confirming full operational readiness and enabling consistent tasking despite RAN-wide maintenance backlogs.[52][10]

Role, Achievements, and Challenges

Strategic Contributions to Australian Defense

HMAS Choules fills a critical amphibious lift gap in the Royal Australian Navy's fleet prior to the Canberra-class landing helicopter docks achieving full operational capability, providing essential strategic sealift for rapid power projection across the Indo-Pacific region.[1][59] With a displacement of 16,000 tonnes and capacity for 23 M1A1 Abrams main battle tanks alongside 150 light vehicles and over 300 troops, the vessel enables the deployment of heavy armored forces to deter aggression by supporting ground maneuver elements in contested environments.[1][2] This capability underpins Australia's defense posture by facilitating the timely insertion of mechanized units without reliance on airlift limitations or commercial charters, prioritizing credible hard power over less survivable alternatives.[60] The ship's logistics versatility bolsters alliance interoperability under frameworks such as AUKUS and the Quad, where sustained maritime presence demands reliable sealift to integrate Australian forces with partners like the United States, United Kingdom, Japan, and India.[61] By accommodating vehicles, landing craft, and aviation operations—including helicopters for vertical logistics—it extends operational reach during joint maneuvers, ensuring force sustainment in dispersed operations across expansive theaters.[1] This role enhances collective deterrence by distributing risk and capability burdens, allowing larger assets to focus on high-end threats while Choules handles tactical reinforcement.[62] In fleet-level assessments, Choules delivers verifiable strategic value through its availability for deployments when LHD platforms are constrained, as highlighted in the November 2023 Fleet Command Board deliberations, which emphasized maintaining dual-ship amphibious readiness with one LHD and Choules.[63] Acquired at a fraction of new-build costs—approximately A$100 million in 2011—the vessel offers efficient per-tonne lift economics compared to bespoke alternatives, optimizing resource allocation toward core warfighting readiness rather than ancillary roles.[64] This sustains Australia's ability to generate combat power independently, reinforcing national security amid regional tensions.

Notable Operations and Reliability Record

HMAS Choules, originally as RFA Largs Bay, contributed to international humanitarian relief efforts following the 2010 Haiti earthquake, departing exercises on 3 February 2010 to deliver a cargo of aid supplies, which arrived on 18 February and were unloaded to support recovery operations.[15] This demonstrated the vessel's capacity for rapid-response logistics in disaster scenarios, carrying essential humanitarian cargo across 4,000 nautical miles without reported mechanical failures during the transit.[16] In Royal Australian Navy service, Choules participated in Exercise Talisman Sabre 2025, the largest iteration of the bilateral Australia-U.S. exercise with over 43,000 personnel from 19 nations, embarking the full Australian Amphibious Force—including troops, vehicles, and helicopters—in under one tidal cycle alongside HMAS Canberra.[47] The ship supported amphibious landings at Cowley Beach and multi-domain operations across northern Australia and Papua New Guinea from 13 July to 4 August 2025, facilitating the transport of heavy equipment and personnel in coordination with allied forces.[65] Choules deployed for Anti-Submarine Warfare Exercise (ASWEX) 2025, the Royal Australian Navy's most complex such drill in over a decade, operating off Western Australia from April to May 2025 amid challenging maritime conditions to integrate surface, air, and subsurface assets with allies including New Zealand.[3] The exercise concluded successfully on 1 May 2025, with Choules providing logistical support and demonstrating endurance in high-stakes anti-submarine scenarios.[66] Earlier, in 2013, Choules anchored off Manus Island for four months, delivering maritime support to Australian border protection operations by housing personnel involved in immigration processing and enabling efficient transfer of supplies and equipment.[67] This multi-role utility extended to a 2024 Pacific deployment, where it transported and offloaded 14 Bushmaster Protected Mobility Vehicles to Fiji, underscoring operational flexibility across theaters.[68] The ship's reliability record reflects robust design and post-acquisition enhancements, with no major breakdowns reported in recent years despite early 2012 propulsion defects resolved through modifications.[69] It has consistently transported thousands of troops, over 150 light vehicles, and heavy assets like tanks in exercises and deployments, operating reliably in varied environments from tropical Pacific waters to temperate southern exercises.[2] Defence assessments highlight its adaptability and dependability, performing critical sealift roles without compromising mission timelines.[3]

Criticisms, Maintenance Issues, and Procurement Debates

The procurement of HMAS Choules, originally RFA Largs Bay, in April 2011 for A$102 million represented a pragmatic response to urgent amphibious capability shortfalls in the Royal Australian Navy (RAN), serving as a low-cost interim asset until the commissioning of the Canberra-class landing helicopter docks (LHDs). Critics, including defence analysts, argued that acquiring a five-year-old, UK-built vessel undermined long-term self-reliance and domestic shipbuilding industry development, favoring instead new Australian-constructed platforms to align with national strategic autonomy goals. The purchase bypassed competitive tender processes typical for major acquisitions, prioritizing speed over bespoke design tailored to RAN operational profiles.[19][70][71] The UK's sale stemmed from the 2010 Strategic Defence and Security Review, which mandated reductions in amphibious forces to generate £8 billion in savings over four years amid post-financial crisis austerity, reallocating resources toward carrier strike capabilities rather than indicating flaws in the Bay-class design itself. In Australia, ongoing reliance on Choules into the 2020s—due to delays in replacements like the Supply-class replenishment ships—has fueled debates on sunk costs, with some commentators questioning whether the stopgap acquisition inadvertently locked the RAN into sustaining an ageing platform amid escalating maintenance demands.[72][73] Maintenance challenges emerged soon after acquisition, with a propulsion system fault in June 2012 forcing the ship to return to Sydney Harbour just days into a transit to Queensland for Exercise Hamel, incurring repairs estimated at up to A$10 million and sidelining operations until April 2013. Inspections revealed premature ageing in transformers and corrosion in wet exhaust systems, attributed to the vessel's prior North Atlantic service and inherited mild steel components prone to degradation after 12 years. These issues paralleled broader propulsion troubles in RAN assets like the LHDs, highlighting systemic sustainment gaps in diesel-mechanical systems.[74][75][69] By 2023, Choules required an extended refit addressing these defects, followed by sea trials to verify reliability, yet fleet-wide material deficiencies reported in 2025 audits raised concerns over its extended viability, with RAN leaders noting a 97-99% probability of critical system failures across surface vessels due to deferred maintenance funding. A June 2025 Australian National Audit Office report on LHD sustainment cited Choules unreliability as necessitating unplanned diversions of higher-capability ships for disaster response tasks, exacerbating operational strain. Counterarguments emphasize empirical low downtime relative to peers, attributing interruptions to budget-constrained upkeep rather than design inherent weaknesses, and crediting fiscal realism in the original UK divestment for avoiding costlier new-build alternatives.[52][10][63]

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