The Galactic Alliance Defense Fleet originated from the New Republic Defense Fleet. During the Yuuzhan Vong War, the New Republic was reformed into the Galactic Alliance. The new government absorbed its predecessor's forces and continued to fight the Yuuzhan Vong, whose empire collapsed by the end of galaxy-wide war.
The Galactic Alliance Defense Fleet was modeled on its predecessor's organizational structure of five fleets. At the Battle of Coruscant in 27 ABY, Supreme Commander Sien Sovv had positioned three in the system, representing the entire augmented strength of the First Fleet, Second Fleet, and Third Fleet commanded respectively by Admiral Traest Kre'fey, General Garm Bel Iblis and General Wedge Antilles.
All the senior commanders survived the battle: Sovv subsequently reappeared at Mon Calamari, while Kre'fey regrouped at Kashyyyk, Bel Iblis organized a defensive posture around the major shipyards at Fondor and Tallaan in Tapani sector, and Antilles moved first to Borleias and then Kuat. Of course, in the aftermath of the tactical and strategic rout of the Defense Force and the collapse of the Galactic government, the forces which had attached themselves to each commander bore little relationship to the former order of battle, but by 29 ABY, the old Fleet designations were once more being applied to the forces under their command.
At this time, the old designation of the Fourth Fleet was also revived, although it is unclear how much of the old Fourth Fleet had survived to be regrouped into what was now essentially the front-line fighting force of the Imperial Navy under its Supreme Fleet Commander, Grand Admiral Gilad Pellaeon. Elements of these four fleets were heavily involved in the defense of Mon Calamari and the reconquest of Coruscant. The fate of the old Fifth Fleet is unclear: it had been guarding Bothawui in the last years of the New Republic, and the designation is not heard of again until the time of the Swarm War, by which time it was commanded by the young Bothan Admiral Nek Bwua'tu. The Fifth Fleet had evidently undergone some reorganization in the interim, as the fleet flagship was the post-war Star Destroyer Admiral Ackbar, and the Mon Mothma, former flagship of the Third Fleet, had been assigned as the command ship of a subordinate task force commanded by Commodore Gavin Darklighter.
The Alliance's shipbuilding machine had been pushed into overdrive at the peak of the Yuuzhan Vong War, and thus by the time of the Swarm War the Defense Fleet had swollen to Nine Fleets. Sien Sovv administered an enormous reorganization of the Defense Force, which involved the construction of General Crix Madine Military Reserve in the Coruscant system.
- Bothan Assault Cruiser
- Dreadnaught-class heavy cruiser
- Hapan Battle Dragon
- Imperial-class Star Destroyer
- Imperious-class Star Destroyer
- Majestic-class heavy cruiser
- MC80 Liberty type Star Cruiser
- MC80B Star Cruiser
- MC90 Star Cruiser
- Nebula-class Star Destroyer
- Rejuvenator-class Star Destroyer
- Republic-class cruiser
- Republic-class Star Destroyer
- Victory-class Star Destroyer
- A-9 Vigilance interceptor
- Aleph-class starfighter
- BB-2 Starfire fighter-bomber
- BTL Y-wing starfighter
- B-wing starfighter
- CF9 Crossfire starfighter
- Eta-5 interceptor
- E-wing escort starfighter
- I4 Ionizer starfighter
- Jumpstar HPF starfighter
- Miy'til starfighter
- RC-2 Twilight scoutship
- RZ-1 A-wing interceptor
- T-65 X-wing starfighter
- TIE/sa bomber
- TIE/IN interceptor
- TIE/D Defender
- X-83 TwinTail starfighter
- Z-95 Headhunter
- Zonama Sekotan fighter
- Jade Shadow
- Freebooter-class transport
- Hajen-class fleet tender
- J-1 shuttle
- Lambda-class T-4a shuttle
- MT dropship
- Sabertooth-class assault/rescue vessel
- Sentinel-class landing craft
- Spinward-class tender
- V-wing Speeder Transport, Model A
- YT-1300 light freighter
- YT-2000 light freighter
- YT-2400 light freighter
- YZ-2500 heavy transport
- Alliance
- Admiral Ackbar
- Ansta
- Blue Diver
- Bounty
- Corellian Way
- Coriolis
- Daring
- Dauntless
- Dodonna
- Dpso
- Elegos A'Kla
- Firethorn
- Galactic Voyager
- Guardian
- Harbinger
- Healing Star
- Indomitable
- Jade Shadow
- Justice
- Megador
- Memory of Ithor
- Millennium Falcon
- Mon Adapyne
- Mon Mothma
- Pride of Corellia
- Pride of Selonia
- Ocean
- Olovin
- Ralroost
- Rebel Dream
- Redheart
- Resolute
- Shamunaar
- Spritespray
- Starrunner
- Starsider
- Viscount
- Vortex Wind
- Yald
- - AdmiralTraest Kre'fey (Battle of Yuuzhan'tar)
- - GeneralGarm Bel Iblis (Liberation of Coruscant); AdmiralMatric Klauskin (Battle of Tralus)
- - GeneralWedge Antilles (Liberation of Coruscant)
- - Grand AdmiralGilad Pellaeon (Liberation of Coruscant); AdmiralRatobo (Second Battle of Balmorra)
- - AdmiralNek Bwua'tu (Battle of the Murgo Choke)