UNSC Leader Changes:
Captain Cutter: Can train Sharpshooters.
Sergeant Forge: Can train Cyclops Enforcers.
Professor Anders: Can train Cryotroopers.
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UNSC Leader Power Changes:
Transport: Can transport a total of 6 infantry units and 3 vehicles.
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Covenant Building Changes:
Beam Turrets: Replaced Repeater Turrets for Beam Turrets. Beam Turrets fire a beam of constant damaging plasma.
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COV Leader Changes:
Arbiter: Can train Elite Rangers, Specters, Elite Ultras and Revenants.
Prophet Of Regret: Can Ranged Elite Honor Guards and and Revenants.
Brute Chieftain: Can train Brute Honor Guards, Prowlers and Suicide Engineers.
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UNSC Unit Changes:
Gauss Warthog: Takes up 1 population.
Elephant: Only have two turrets.
(New) Marine Sharpshooters: Anti-Infantry unit.
(New) Cyclops Enforcers: Anti-Vehicle unit.
(New) Cryo Trooper: Anti-Infantry unit.
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Covenant Unit Changes :
Chopper: Takes up 1 population. (Brute Chieftain Only)
(New) Elite Ranger: Anti-Infantry unit.
(New) Elite Ultra: Anti-Vehicle unit.
(New) Ranged Honor Guard: Anti-Infantry unit.
(New) Brute Honor Guard: Anti-Infantry unit.
(New) Specter: Light Vehicle (Replaces Needler Ghost)
(New) Revenant: Light Vehicle.
(New) Prowler: Light Vehicle.
(New) Suicide Engineer: Support unit.
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Rebel Changes
"Borrowed" Warthog: No longer hijackable.
"Borrowed" Immobile Warthog: No longer hijackable.
"Borrowed" Rescue Hornet: No longer hijackable.
Rogue Spartan: No longer stuns when in melee range.
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Flood Changes
Big Buff: Nearly every unit in the game can be infected and used by the Flood.