Halo 4 Armour

Recruit: Starting Armor

Warrior: Reach the Rank of SR-8

Air Assult: Reach the Rank of SR-11

Soldier: Reach the Rank of SR-15

Aviator: Reach the Rank of SR-17

Defender: Reach the Rank of SR-21

Recon: Reach the Rank of SR-26

E.V.A. : Reach the Rank of SR-27

Warmaster: Reach the Rank of SR-37

Scout: Reach the Rank of SR-38

Orbital: Reach the Rank of SR-41

Infiltrator: Reach the Rank of SR-42

Hazop: Reach the Rank of SR-43

E.O.D. : Reach the Rank of SR-45

Oceanic: Reach the Rank of SR-47

Enforcer: Reach the Rank of SR-50

Mk. VI: Complete the campaign on Legendary (Solo or Co-op)

C.I.O: Spartan Slayer Master

Gungnir: Slayer Victory Master

Venator: Assassin Master

Commando: Dominion Victory Master

Ranger: Combat Opportunity Master

Protector: UNSC Loadout Master

Vanguard: Forerunner Enemy Mastery

Raider: Halo Waypoint Classified Unlock

Fotus: Limited Edition Halo Xbox

Scanner: War Games Map Pass or Limited Edition Halo 4

Strider: War Games Map Pass or Limited Edition Halo 4

Deadeye: Pre-order from BestBuy / Play.com

Locus: Pre-order from Future Shop / Mighty Ape or Play Mountain Dew King of the Hill iPhone app

Operator: Unlocked After Completing Specialization

Wetworker: Unlocked After Completing Specialization

Pioneer: Unlocked After Completing Specialization

Pathfinder: Unlocked After Completing Specialization

Rogue: Unlocked After Completing Specialization

Tracker: Unlocked After Completing Specialization

Stalker: Unlocked After Completing Specialization

Engineer: Unlocked After Completing Specialization