Australia's HMAS Hobart destroyer completes first upgrade with Tomahawk and Aegis ballistic missile defence.

Royal Australian Navy Vice Admiral Matthew Buckley confirmed on August 20, 2026, that HMAS Hobart has completed the yard phase of its Destroyer Capability Enhancement (DCE) program at Osborne Naval Shipyard under Project SEA 4000 Phase 6. The A$4.29 billion modernization replaces legacy combat systems with Aegis Baseline 9 and Saab’s 9LV Australian Interface while integrating Tomahawk land-attack cruise missiles, Standard Missile 6 (SM-6), and Naval Strike Missiles. This mid-life upgrade establishes Integrated Air and Missile Defence (IAMD) across the class, maintaining a fixed 48-cell Mk 41 Vertical Launch System configuration per ship for the next two decades.

The A$4.29 billion SEA 4000 Phase 6 program modernizes three Hobart-class destroyers, combining Aegis Baseline 9 with a 48-cell Mk 41 VLS to support 1,500 km Tomahawk strike weapons, SM-6, and SM-2 Block IIIC missiles. Canister-launched Naval Strike Missiles preserve vertical-launch capacity, balancing fleet air defense, terminal ballistic missile defense, and long-range precision surface attack.

Related topic: Australian Hunter-class frigates gain direct link to US Aegis missile defense system

The Destroyer Capability Enhancement (DCE) transforms the HMAS Hobart from an air defence destroyer into a multi-mission combatant by adding Aegis Baseline 9 integrated missile defence, Tomahawk, SM-6, and NSM missiles, upgraded electronic warfare and communications, and a new Saab 9LV-based Australian combat-system interface. (Picture source: Australian MoD)

On August 20, 2026, Australia's Vice Admiral Matthew Buckley confirmed that HMAS Hobart was the first Hobart-class destroyer to complete the yard phase of its Destroyer Capability Enhancement (DCE) program at Osborne Naval Shipyard under SEA 4000 Phase 6. The yard period began in February 2026 and forms part of an A$4.29 billion effort covering HMAS Hobart, HMAS Brisbane and HMAS Sydney. The DCE replaces major elements of the ships' combat system architecture, integrates Tomahawk and SM-6, introduces Naval Strike Missile in place of Harpoon, updates electronic warfare and communications equipment, and installs a new Australian combat system interface associated with Saab's 9LV architecture. The three destroyers are expected to remain in service for another two decades and beyond, so the DCE program is effectively a mid-life upgrade rather than a routine maintenance cycle.

Each ship nevertheless retains the same 48-cell Mk 41 Vertical Launching System (VLS) it had before the upgrade. That leaves the Royal Australian Navy (RAN) with 144 Mk 41 cells across the entire Hobart class, a fixed physical ceiling that now has to support long-range land attack, conventional air defence and terminal ballistic missile defence at the same time. The principal combat system change is the transition from the earlier Hobart-class Aegis configuration to Baseline 9 through the replacement of computing hardware, software and associated shipboard interfaces. The previous configuration was centered mainly on fleet air defence against aircraft and anti-ship missiles. Baseline 9 expands the combat system into Integrated Air and Missile Defence (IAMD), allowing the ship to process and manage aircraft, cruise missile and ballistic missile tracks in a common combat environment.

The practical addition is not simply a larger air picture but a new class of engagement: terminal ballistic missile defence requires the destroyer to detect or receive tracks on missiles descending toward their targets, maintain sufficiently accurate engagement-quality data, and cue an interceptor within much shorter timelines than those associated with conventional aircraft interception. The ship can therefore contribute to the defence of a naval task group, an operating area or selected assets against mixed air and missile threats rather than functioning only as an escort against aircraft and sea-skimming missiles. The important constraint is that Baseline 9 creates new demand for the ship's missile magazine without increasing that magazine. Every SM-6 embarked for ballistic missile defence occupies a cell that cannot simultaneously hold an SM-2 or Tomahawk. 

Speaking of which, the Tomahawk integration gives the Hobart-class a new ship-launched land-attack missile exceeding 1,500 km and changes the operational reach of the destroyer force. Australia is acquiring more than 200 Tomahawk cruise missiles through an investment of approximately A$1.3 billion. At that range, a Hobart-class destroyer can strike fixed targets such as air bases, command facilities, missile sites and logistics hubs from well outside the distances associated with legacy ship-launched anti-ship weapons. HMAS Brisbane became the first RAN vessel to fire a Tomahawk in December 2024, about twenty months before HMAS Hobart completed its August 2026 yard milestone, so the weapon had already entered fleet introduction before the first DCE ship returned to the water. The central limitation is magazine arithmetic. Eight Tomahawks consume 16.7 percent of a 48-cell VLS, 12 consume 25 percent, 16 consume 33.3 percent, and 24 consume 50 percent.

If HMAS Hobart carried 16 Tomahawks, only 32 Mk 41 cells would remain for SM-2, SM-6, and any other compatible weapons. If all three destroyers carried 16 Tomahawks, the class would allocate 48 of its 144 cells, one-third of total VLS capacity, to land attack before loading a single Standard Missile. For its part, the SM-6 places additional pressure on the same 48-cell magazine because it adds several missions without adding launch positions. Australia has committed A$7 billion to its inventories of SM-2 Block IIIC and SM-6. The SM-6 adds extended-range air defence, terminal ballistic missile defence and a secondary anti-surface capability, while the SM-2 Block IIIC remains part of the broader air defence inventory. HMAS Sydney fired SM-6s in 2024, establishing another missile milestone before the HMAS Hobart entered the DCE yard period in February 2026. The resulting loadout problem is straightforward.

A configuration with 16 Tomahawks, 12 SM-6 and 12 SM-2 would consume 40 cells and leave only eight for additional VLS weapons. A configuration with 12 Tomahawks, 18 SM-6 and 18 SM-2 would fill all 48 cells. Repeated across the class, that second example would produce 36 Tomahawks, 54 SM-6 and 54 SM-2 in 144 cells. Those are illustrative distributions rather than RAN load plans, but they quantify the trade-off created by the upgrade: every increase in offensive strike capacity logically reduces defensive depth unless another mission receives fewer rounds. The Naval Strike Missile (NSM) partly separates anti-ship warfare from that competition because it replaces the Harpoon in dedicated canister launchers rather than occupying Mk 41 cells. Australia has committed more than A$1 billion to NSM inventories across the fleet.

The missile provides a high-subsonic, sea-skimming precision anti-ship weapon while preserving the destroyer's 48 vertical-launch cells for Tomahawk, SM-2 and SM-6 missiles. That distinction is operationally important on a ship with limited magazine depth. Eight Mk 41 cells represent 16.7 percent of total VLS capacity, so moving the primary anti-ship missile outside the vertical launcher preserves a meaningful share of the ship's defensive and land-attack inventory. The SM-6 can still be used against surface targets, but doing so would draw from missiles also needed for air and ballistic missile defence. The resulting weapons arrangement divides missions across different launcher types: the NSM handles the dedicated anti-ship role from canisters, the Tomahawk handles long-range land attack from Mk 41, and SM-2s and SM-6s provide the principal air and missile defence capacity.

The DCE also required substantial reconstruction inside the HMAS Hobart, particularly in the combat information center, which was completely dismantled before the installation of Saab Australia's new Australian Interface. The system replaces the earlier Australian Tactical Interface and links Aegis with Australian-specific combat system functions, ship systems and tactical networks through an architecture associated with Saab's 9LV Combat Management System. This type of refit requires new computing equipment, electrical distribution, cooling, cabling, consoles, equipment racks, data interfaces, communications links and weapons connections to be integrated inside a 147-meter hull whose internal arrangement predates the new systems.

BAE Systems Australia is conducting the work at Osborne; BAE Systems Australia, Saab Australia and Lockheed Martin Australia form the Combat Systems Integration – Integrated Project Team (CSI-IPT); and Navantia Australia carries responsibility for platform-system design and physical integration work. The same broad Aegis Baseline 9 and Australian Interface combination is planned for the Hunter-class frigates, although the Hunter will use CEA Technologies' CEAFAR 2 phased-array radar. That creates a new combat system commonality between Australia's destroyer and future frigate forces while retaining different radar, hull and platform architectures. The program's cost and fleet-size relationship is also significant. SEA 4000 Phase 6 assigns A$4.29 billion to three destroyers, and the ships are being upgraded sequentially because removing more than one at a time would sharply reduce available fleet capacity.

With only three Hobart-class hulls, one ship in a deep modernization period represents 33.3 percent of the class unavailable for normal employment before maintenance, training and readiness demands on the remaining two ships are considered. The work is centered at Osborne under the wider maritime sustainment framework established through Plan Galileo in 2019 and creates requirements across electrical work, fabrication, insulation, machining, mechanical services, platform maintenance and combat system integration. Hobart-class support expenditure in 2023-24 reached A$242 million against a revised estimate of A$239 million, with preparations increasing for the Aegis upgrade and Tomahawk integration.

Aegis Combat System expenditure in the same financial year was A$89 million against a revised estimate of A$117 million, a A$27 million negative variation associated with lower Foreign Military Sales case disbursements, Australian industry cost efficiencies and reduced demand for inventory repair and replacement. The modernization follows SEA 4000 Phase 3, which delivered all three destroyers and their support system, with the last ship commissioned in May 2020. Operationally, the Destroyer Capability Enhancement (DCE) program moves the Hobart-class from a destroyer focused primarily on conventional air defence and anti-ship warfare into a multi-mission vessel able to conduct integrated air and missile defence, terminal ballistic missile defence, long-range land attack and networked operations alongside its existing roles.

The Tomahawk extends the class's reach beyond 1,500 km, the SM-6 adds a ballistic missile defence and extended-range air defence capability, the NSM replaces Harpoon without using Mk 41 cells, and the upgraded combat system allows these weapons and sensors to be managed within a common Australian interface. The ships therefore gain greater flexibility in how they support a task group or joint force: they can defend against aircraft and missiles, contribute to protection against ballistic missiles, strike land targets at long range, and conduct anti-ship operations within the same deployment. The DCE does not change the number of destroyers or their 48-cell Mk 41 launchers, but it substantially expands what each ship can do with those existing hulls and launch systems.

Written by Jérôme Brahy

Jérôme Brahy is a defense analyst and documentalist at Army Recognition. He specializes in naval modernization, aviation, drones, armored vehicles, and artillery, with a focus on strategic developments in the United States, China, Ukraine, Russia, Türkiye, and Belgium. His analyses go beyond the facts, providing context, identifying key actors, and explaining why defense news matters on a global scale.

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