Sub-factions are made to promote specific playstyles.
Both GDI and NOD have 3 sub-factions beside the main/standard one.

In general, all sub-factions have:
- 3 unit types that earn XP with 1.5x rate, helping you to get elite units of these types easier and faster
- a unique mechanics / bonus or two
- 3 unit types that are not available

GDI
------------ Armor Division -------------
1.5x XP - Medium tank, Mammoth tank, Grenade Launcher
Medium tanks and Mammoth tanks are available earlier.
Chinooks can transport vehicles
N/A - Rocket soldier, Orca, Humvee

------------ Air Supremacy -------------
1.5x XP - Orca, MLRS, Rocket Soldier
Airstrikes have +1 plane, Chinooks are faster.
N/A - Mammoth tank, Medium tank, APC

------------ Spec Ops -----------------
1.5x XP - All infantry
Commando can snipe vehicle pilots.
N/A - Medium tank, Mammoth tank, MLRS


NOD
------------ Black Hand -------------
1.5x XP - Flamethrower, Flame tank, Chem-warrior
Flamethowers and Flame tanks are available earlier.
Visceroids spawn for free if player has a Bio-Lab
N/A - Minigunner, Artillery, Apache

------------ Stealth Tech -------------
1.5x XP - Stealth tank, Stealth soldier, Infiltrator
Stealth soldiers are 2.5x cheaper. Infiltrators's cloak lasts 1.5x longer.
N/A - Flamethrower, Flame tank, Light tank

---------------- Horde -----------------
1.5x XP - Buggies, Recon Bikes, Artillery
Primary Hands of Nod will spawn free Minigunners every 30-40 seconds
N/A - Obelisk of Light, Light tank, Stealth tank, Apache, SSM Launcher