Fleet rotation and principal bases
The three-carrier policy defines commissioned fighting groups. The two additional programmes are future hull and air-wing replacement projects, not two already deployable fleets. Two commissioned groups normally operate at sea while the third cycles through rest, training and maintenance. Long refits or casualties can reduce that availability, so temporary reductions and allied support remain part of planning.
Sydney and Fremantle are the principal carrier and submarine bases. Sydney supports the Pacific deployment and eastern fleet establishment; Fremantle supports the Indian Ocean and western approaches. Both receive protected dockyard facilities, nuclear support establishments, defended anchorages and extensive air support. Darwin, New Zealand and the northern and Pacific territories provide forward facilities, surveillance and regional repair, while the main fleet hubs remain eastern and western Australia.
Rotation model
| Position in the system | Normal purpose |
|---|---|
| Commissioned group one | Fremantle-based deployment to the western and northern approaches, including Indian Ocean commitments |
| Commissioned group two | Sydney-based Pacific deployment, territorial coverage or an allied expedition |
| Commissioned group three | Rest, training, maintenance and preparation for the next deployment |
| Future programme four | A replacement carrier under construction, with air-wing and escort integration work |
| Future programme five | The succeeding design, early production and workforce programme |
Carrier lineage
The carrier sequence records the development of the principal fleet. Conventional, initially British-derived carriers establish the doctrine first. The nuclear generations adopt an American-led design lineage, with American cooperation supplying the core design and Australian yards constructing the ships around domestic electronics and support standards. Propulsion access follows separate classified agreements. Names can pass to replacement ships after the preceding vessel leaves service.
Carrier generations
| Nuclear carrier generation | commissioned ships | Service entry |
|---|---|---|
| Commonwealth class | HMSCS Melbourne, HMSCS Sydney, HMSCS Australia | 1972, 1977 and 1982 |
| Federation class | HMSCS New Zealand, HMSCS Pacific, HMSCS Southern Cross | 2005, 2012 and 2019 |
| Successor programmes | Two rolling replacement projects | Construction and design underway in 2020 |
Air-wing establishments
The first Commonwealth-class ships operate earlier aircraft before the naval F-111 becomes available. Later refits add the relevant handling and aviation systems. The two large nuclear carriers in service in 1980 each have a planned total air wing of 72 aircraft; the third nuclear carrier joins in 1982, replacing the remaining conventional member of the principal rotation. By 2020, the three Federation-class successors each have a planned total of 96 aircraft. Those totals include fighters, strike aircraft, reconnaissance, electronic attack, airborne early warning and rotary-wing support. They are complete air-wing establishments, not counts of naval F-111s alone.
The Federation class is a larger subsequent nuclear generation. Flight decks, hangars, aviation fuel, weapons handling, crews and maintenance capacity are designed for the expanded complement. Temporary embarkations and aircraft availability can vary, while the planning figures remain 72 in 1980 and 96 in 2020. Carrier compatibility is dated and specific to the ship class; the early conventional carriers retain smaller wings suited to their own designs.
Illustrative force baseline
The national planning baseline places 24 nuclear missile cruisers and 60 nuclear submarines alongside three commissioned carriers. Eastern and Western commands each receive twelve cruisers and thirty submarines, divided into 24 attack and six guided-missile boats per fleet. HMSCS New Zealand anchors the Eastern Fleet, HMSCS Pacific the Western Fleet, and HMSCS Southern Cross forms the national rotation pool; assignments change with refit schedules. These are illustrative design quantities rather than completed mod inventories. A shared cruiser hull can support air-defence, submarine-warfare and strike variants while retaining common machinery, communications and support standards. Conventional escorts, amphibious ships and replenishment vessels complete the force.
Jervis Bay was the capital's maritime port and a major fleet concentration, amphibious training and replenishment centre. Singapore provided a forward national port after 2020. Port Vila supported the Eastern Fleet after Vanuatu's territorial admission in 1972. Cam Ranh Bay and Vung Tau remained agreed facilities on Vietnamese territory. Malaysian naval and air installations operated through host-state agreements. National bases and foreign treaty access were recorded separately in fleet planning.