NOTE: Playable eras for progressive GC is 2-4. Selecting era 1 will start as era 2 ingame. Eras advance around every 30 weeks, but you can also select the starting era in the campaign options. This option does change the state of the galaxy to match the condition of the war at the time.

Only FTGU has an era 1, which restricts your roster to Pre-Clone Wars units.

Republic:

Heroes:
Yoda (Infantry, Eta-2)
Mace Windu (Infantry, Eta-2)
Kit Fisto (Infantry, Eta-2)
Aayla Secura (Infantry, Eta-2)
Shaak Ti (Infantry, Eta-2)
Obi Wan Kenobi (Infantry, Eta-2)
Anakin Skywalker (Infantry, Eta-2)/Darth Vader
Plo Koon (Infantry, Eta-2)
Raymus Antilles (CR90 Corvette - Tantive IV) (Mothma Story path reward)
Captain Pellaeon (Acclamator Combat Model - Leveler)
Adar Tallon (Acclamator 1 - Sundiver/Praetor-1 Battalion)
Captain Dallin (Dreadnaught Heavy Cruiser - Mersel Kebir)
Admiral Wieler (Venator Star Destroyer - Resilient) (Venator Pool)
Admiral Coburn (Venator Star Destroyer - Triumphant)
Admiral Yularen (Venator Star Destroyer - Resolute)
Admiral Dron (Venator Star Destroyer - Selfless) (Venator Pool)
Admiral Dao (Venator Star Destroyer - Omen) (Venator Pool)
Captain Denimoor (Venator Star Destroyer - Tenacious) (Venator Pool)
Sagoro Autem (Venator Star Destroyer - Recalcitrant) (Venator Pool)
Octavian Grant (Venator Star Destroyer - Audacity)
Trachta (Venator Star Destroyer - Rebirth)
Denn Wessex (Venator Star Destroyer - Redoubt)
Wilhuff Tarkin (Venator Star Destroyer - Sovereign/Imperator Star Destroyer - Executrix)
Captain Screed (Victory-1 Star Destroyer - Arlionne)
Captain Dodonna (Victory-1 Star Destroyer - Ardent)
Admiral Mulleen (Imperator Star Destroyer - Imperator) (Palpatine Story path reward)
General Gentis (AT-TE Walker)
Hurst Romodi (A5 Juggernaut)
Kendal Ozzel (LAAT/i)
Delta Squad (Infantry)
Fordo (Infantry, Phase 1 and 2)
Rex (Infantry, Phase 1 and 2)
Cody (Infantry, Phase 1 and 2)
Sate Pestage - Economic Hero
Mon Mothma - Economic Hero (Mothma Story path reward)
Bail Organa - Economic Hero (Mothma Story path reward)
Emperor Palpatine - Ground Hero (Palpatine Story path reward)

Space:
V-19 Torrent - Common, less common era 4
BTL-B Y-Wing - Common
#2 Warpod Bomber (Older design/Era 1 generally, otherwise extremely uncommon)
Z-95 Headhunter - Old, phased out as eras progress
Clone Z-95 Headhunter - Era 3
Cloakshape Fighter - Old, phased out as eras progress
ARC-170 Starfighter - Common
Alpha-3 Nimbus-class V-wing - Era 4 common, missile variant on heroes
Eta-2 Actis Interceptor - Hero Fighters/Transport, rare squadron era 3+
T.I.E. Starfighter (Grandparent to TIE/ln) - Varied, missile variant on heroes
GAT-12g Skipray Blastboat - Rare
Citadel-class Civilian Cruiser (Older design/Era 1 only)
Light Assault Cruiser (Consular-class LAC Refit)
CR90 (Corellian Corvette)
DP20 (Corellian Gunboat)
Pelta Assault Frigate
Pelta Tender (Deploys interdiction mines)
Galleon Tender (Older design/Era 1, starting forces only)
Carrack Cruiser (Clone Wars loadout)
Arquitens Light Cruiser
Neutron-Star Bulk Cruiser (Mothma Story path reward)
PDF Dreadnaught Heavy Cruiser (Older design/Era 1, starting forces only)
Dreadnaught Heavy Cruiser
Dreadnaught Carrier (Refit from PDF Dreadnaughts)
Acclamator I (Carrier Loadout)
Acclamator I (Assault Loadout)
Acclamator II - Unlocks era 4
Victory-I Star Destroyer - Research option available in era 3
Victory-II Star Destroyer - Unlocks era 4
Venator Star Destroyer - Research option available around week 10 of era 2
Invincible Battlecruiser - Build locked when era 2 finishes
Imperator Star Destroyer (Palpatine Story path reward - Kuat Contract)
Tector-class Star Destroyer (Palpatine Story path reward - Kuat Contract)
Secutor-class Star Destroyer (Palpatine Story path reward - Kuat Contract)
Praetor-I Battlecruiser
Mandator-I Star Dreadnought
Mandator-II Star Dreadnought (Era 3+, upgrade from Mandator-I)

Ground:
PDF Troopers - Starting forces only
Clone Troopers (P1 and P2) - Era 3 research option unlocks P2
Clone Commandos
ARC Troopers (P1 and P2) - Era 3 research option unlocks P2
Jedi Knight
74-Z Speeder Bike - Era 3 Phase 2 research option replaces with BARC
BARC Speeder - Era 3 Phase 2 research option replaces 74-Z
SD-6 Hulk Infantry Droid
All Terrain Recon Transport (AT-RT)
All Terrain Personal Transport (AT-PT)
All Terrain Attack Pod (AT-AP) - Unlocks era 4
All Terrain Tactical Enforcer (AT-TE)
Low Altitude Assault Transport/infantry (LAAT)
TX-130 Saber Tank
AV-7 Antivehicle Cannon
Infantry Support Platform (Swamp Speeder) - Unlocks era 3
A4 Juggernaut (Older design/Era 1 only)
A5 Juggernaut
A6 Juggernaut - Unlocks era 3

Clone Legions - Not buildable, use other mechanics to represent
Diplomatic Escort Group - Deploy from gov buildings in era 2-3.
Shock Troopers - Deploy from government buildings as garrisons in era 4.
501st: Deploy Anakin Skywalker on ground prior to landing clone troops.
212th: Deploy Obiwan Kenobi on ground prior to landing clone troops.
104th/wolfpack: Deploy Plo Koon on ground prior to landing clone troops.
327th: Deploy Aayla Secura on ground prior to landing clone troops.
187th: Deploy Mace Windu on ground prior to landing clone troops.


CIS:

Heroes:
Count Dooku (Infantry)
Assaj Ventress (Infantry, Ginivex)
Sev'rance Tann (Infantry, Ginivex)
Sora Bulq (Infantry)
General Kalani (Infantry)
Nute Gunray (Economic Hero)
Wat Tambor (Economic Hero) (TU Integration)
General Lok Durd (AAT) (TF Integration)
General Whorm Loathsome (AAT)
Captain Canteval (Munificent-class Star Frigate ) (IGBC Integration)
Captain Rel Harsol (Munificent-class Star Frigate - Sa Nalaor)
Captain Shonn Volta (Recusant-class Light Destroyer - Cold Justice)
Major Domb Treetor (Captor Heavy Munitions Cruiser - Lapilli) (TU Integration)
Gizor Dellso - (Providence-class Carrier/Destroyer - Archduke)
Iaco Stark (Recusant Light Destroyer - Vainglorious) CG Integration
Admiral TF1726 (Munificent-class Star Frigate)
Admiral Trench (Providence-class Dreadnought - Invincible)
Admiral Pors Tonith (Lucrehulk-class Battleship - Corpulentus) (IGBC Integration)
Admiral Mar Tuuk (Lucrehulk-class Droid Control Ship - Procurer) (TF Integration)
Admiral Dua Ningo (Bulwark-class Battleship - Unrepentant)
General Calli Trilm (Bulwark-class Battleship - Cataclysm)
General Grievous (Infantry, Upgradeable flagship mechanic - Recusant-class Destroyer | Providence-class Carrier/Destroyer - Invisible Hand | Subjugator-class battleship - Malevolence)

Space:
Vulture Droid Mark 1 - Common
Hyena Droid Bomber - Common
Scarab Starfighter - Old, phased out by CIS era 3, subfactions era 4
Droid Tri-Fighter - Era 3 common
Mankvim-814 - Rare, era 4
Nantex-class Starfighter - Common
Ginivex Fighter - Hero fighter only
Gozanti-Cruiser
C-9979 Carrier
Diamond Cruiser
Hardcell Missile Ship
Kolivex Cruiser (Geonosian Cruiser)
Munifex Light Cruiser
Munificent-class Star Frigate
Captor Heavy Munitions Cruiser
Auxilia Pursuit Destroyer
Recusant-class Light Destroyer
Providence-class Carrier/Destroyer
DH-Omni Supply Ship (Deploys interdiction mines)
Bulwark-class Battlecruiser Mk. I - Research option available in era 3
Bulwark-class Battlecruiser Mk. II - Research option available in era 3
Providence-class Dreadnought (Upscaled version) - Unlock by absorbing Commerce Guild
Recusant-class Dreadnought (Upscaled version) - Unlock by absorbing Commerce Guild
Lucrehulk Battlecarrier, Control Ship version for heroes
Lucrehulk Battleship - Unlocks Era 3
Subjugator-class Battleship

Subfaction Specials: Not buildable by CIS, but existing units are obtained on merge
Marauder Corvette - Techno Union
Interceptor/Action Corvette - Banking Clan
Dreadnaught Heavy Cruiser (Clone Wars loadout) - Banking Clan
Lucrehulk Auxillary Warship/Q-ship - CG and TU buildability and starting forces, Control Ship version for heroes

Ground:
B1 Battle droid
B2 Super Battle droid
BX Commando
Destroyer Droid
Destroyer Droid Mk. II - Unlocks era 4
Single Trooper Aerial Platform (STAP)
Crab Droid
Armoured Assault Tank (AAT)
NR-N99 Persuader-class Droid Enforcer
OG-9 Homing Spider Droid
Hailfire Droid Tank
Heavy Missile Platform Gunship (HMP)
J-1 Proton Cannon
Multi-Troop Transport (MTT)
Magna Octuptarra Droid (Large tri-droid)


NPC Units - Sector Forces, Independent Forces and "From the Ground Up" spawns:
Other units on the list can also show up under these forces.

Space:
IPV-1 Patrol Craft
Katana Fleet DHC