Armor permutations (Halo 4)/Helmet

From Halopedia, the Halo wiki

Helmets
Helmet Unlock (Halo 4) Unlock (Halo: The Master Chief Collection) Skins Unlock (Halo 4) Unlock (Halo: The Master Chief Collection)
Aviator SR-11 Unlocked by default VERG Complete Vehicle Mastery Commendation Unlocked by default on Season 4 update
VISN Classified Flying Colors archive Unlocked by default on Season 4 update
Aviator SR-17 Unlocked by default BOND Complete Wheelman Commendation Unlocked by default
CIO Complete Spartan Slayer Commendation Unlocked by default WEB Pre-order Halo 4 from Amazon.com Unlocked by default on Season 4 update
RUIN Buy the Spartan CIO figure from McFarlane Toys' Halo 4 Series 2 Unlocked by default on Season 4 update
RUSH Classified Flying Colors archive Unlocked by default on Season 4 update
Commando Complete Dominion Victory Commendation Unlocked by default FRCT Complete Flood Victory Commendation Unlocked by default on Season 4 update
Deadeye Pre-order Halo 4 from Best Buy or Play.com Unlocked by default N/A
Defender SR-24 Unlocked by default CTRL Complete Bullet in the Brain Commendation Unlocked by default on Season 4 update
CLMN Buying the Champions Bundle Unlocked by default on Season 4 update
Enforcer SR-50 Unlocked by default TRBL Complete Mounted Turret Commendation Unlocked by default on Season 4 update
TRCR Buying the Champions Bundle Unlocked by default on Season 4 update
Engineer EN-4 Unlocked by default EDGE EN-9 Unlocked by default on Season 4 update
EOD SR-45 Unlocked by default SHWD Complete Regicide Victory Commendation Unlocked by default on Season 4 update
EVA SR-27 Unlocked by default BRCH Complete Hail of Death Commendation Unlocked by default on Season 4 update
FOTUS Buying Halo 4 Limited Edition Console Unlocked by default N/A
GUNGNIR Complete Slayer Victory Commendation Unlocked by default PULS Pre-order Halo 4 from Microsoft Unlocked by default on Season 4 update
HAZOP SR-43 Unlocked by default FRST Pre-order Halo 4 from GameStop Unlocked by default on Season 4 update
Infiltrator SR-42 Unlocked by default TRAC Complete Multikill Commendation Unlocked by default on Season 4 update
PYTN Buying the Champions Bundle Unlocked by default on Season 4 update
Locus Pre-order Halo 4 from MightyApe.co.nz or HMV.com Unlocked by default N/A
Mark V Buying the Infinity Armor Pack or the Champions Bundle Season 7, Tier ?? N/A
Mark VI Complete Legend Commendation Unlocked by default N/A
Oceanic SR-47 Unlocked by default CRCT Pre-order Halo 4 from Walmart Unlocked by default on Season 4 update
SLID Buying the Champions Bundle Unlocked by default on Season 4 update
ODST Buying the Infinity Armor Pack or the Champions Bundle Season 7, Tier ?? N/A
Operator OP-4 Unlocked by default SRFC OP-9 Unlocked by default on Season 4 update
Orbital SR-41 Unlocked by default AEON Complete Covenant Destroyer Commendation Unlocked by default on Season 4 update
SWFT Enter Section 3 code YANUMAS Unlocked by default on Season 4 update
Pathfinder PT-4 Unlocked by default CORE PT-9 Unlocked by default on Season 4 update
Pioneer PR-4 Unlocked by default ADPT PR-9 Unlocked by default on Season 4 update
Prefect Buying the Infinity Armor Pack or the Champions Bundle Season 7, Tier ?? N/A
Protector Complete UNSC Loadout Mastery Commendation Unlocked by default DRFT Complete Weapon Mastery Commendation Unlocked by default on Season 4 update
Raider Classified Requiem Archive I archive Unlocked by default DSST Classified Requiem Archive II archive Unlocked by default on Season 4 update
Ranger Complete Combat Opportunity Commendation Unlocked by default STRK Complete Protector Commendation Unlocked by default on Season 4 update
Recon SR-26 Unlocked by default SURG Complete Covenant Loadout Mastery Commendation Unlocked by default on Season 4 update
Recruit Unlocked by default Unlocked by default PRME Buying Halo 4 Limited Edition Unlocked by default on Season 4 update
Ricochet Buying the Bullseye Pack or the Champions Bundle Season 7, Tier ?? HMTM Buying the Bullseye Pack or the Champions Bundle Season 7
Rogue RG-4 Unlocked by default FCUS RG-9 Unlocked by default on Season 4 update
Scanner Buying the War Games Map Pass Unlocked by default N/A
Scout SR-38 Unlocked by default APEX Complete Oddball Victory Commendation Unlocked by default on Season 4 update
TOXC Buy the Spartan Scout figure from McFarlane Toys' Halo 4 Series 2 Unlocked by default on Season 4 update
Soldier SR-15 Unlocked by default ZNTH Complete Killing Spree Commendation Unlocked by default on Season 4 update
Stalker SK-4 Unlocked by default CRSH SK-9 Unlocked by default on Season 4 update
Strider Buying the War Games Map Pass Unlocked by default N/A
Tracker TK-4 Unlocked by default ADRT TK-9 Unlocked by default on Season 4 update
Vanguard Complete Forerunner Destroyer Commendation Unlocked by default CNVG Complete Flag Victory Commendation Unlocked by default on Season 4 update
Venator Complete Assassin Commendation Unlocked by default RPTR Pre-order Halo 4 from Best Buy Unlocked by default on Season 4 update
BYNT Buying the Champions Bundle Unlocked by default on Season 4 update
RFCT Buying the Didact figure from McFarlane Toys' Halo 4 Series 2 Unlocked by default on Season 4 update
War Master SR-37 Unlocked by default PRML Complete King of the Hill Victory Commendation Unlocked by default on Season 4 update
Warrior SR-8 Unlocked by default MTRX Complete Forerunner Loadout Mastery Commendation Unlocked by default on Season 4 update
Wetwork WK-4 Unlocked by default PRML WK-9 Unlocked by default on Season 4 update