Armor customization (Halo 4)/Helmet

Helmets
Helmet	Unlock (Halo 4)	Unlock (Halo: The Master Chief Collection)	Skins	Unlock (Halo 4)	Unlock (Halo: The Master Chief Collection)
Recruit	Unlocked by default	Unlocked by default	PRME	Buying Halo 4 Limited Edition	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
Air Assault	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
Soldier	SR-15	Unlocked by default	ZNTH	Complete Killing Spree Commendation	Unlocked by default on Season 4 update
Aviator	SR-17	Unlocked by default	BOND	Complete Wheelman Commendation	Unlocked by default on Season 4 update
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
Recon	SR-26	Unlocked by default	SURG	Complete Covenant Loadout Mastery Commendation	Unlocked by default on Season 4 update
E.V.A.	SR-27	Unlocked by default	BRCH	Complete Hail of Death Commendation	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
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
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
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
Hazop	SR-43	Unlocked by default	FRST	Pre-order Halo 4 from GameStop	Unlocked by default on Season 4 update
E.O.D.	SR-45	Unlocked by default	SHDW	Complete Regicide Victory Commendation	Unlocked by default on Season 4 update
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
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
Wetwork	WK-4	Unlocked by default	SHRD	WK-9	Unlocked by default on Season 4 update
Operator	OP-4	Unlocked by default	SRFC	OP-9	Unlocked by default on Season 4 update
Pioneer	PR-4	Unlocked by default	ADPT	PR-9	Unlocked by default on Season 4 update
Pathfinder	PT-4	Unlocked by default	CORE	PT-9	Unlocked by default on Season 4 update
Engineer	EN-4	Unlocked by default	EDGE	EN-9	Unlocked by default on Season 4 update
Stalker	SK-4	Unlocked by default	CRSH	SK-9	Unlocked by default on Season 4 update
Rogue	RG-4	Unlocked by default	FCUS	RG-9	Unlocked by default on Season 4 update
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
C.I.O.	Complete Spartan Slayer Commendation	Unlocked by default	WEB	Pre-order Halo 4 from Amazon.com	Unlocked by default on Season 4 update
			RUSH	Classified Flying Colors archive	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
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
Gungnir	Complete Slayer Victory Commendation	Unlocked by default	PULS	Pre-order Halo 4 from Microsoft	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
Ranger	Complete Combat Opportunity Commendation	Unlocked by default	STRK	Complete Protector Commendation	Unlocked by default on Season 4 update
Protector	Complete UNSC Loadout Mastery Commendation	Unlocked by default	DRFT	Complete Weapon Mastery Commendation	Unlocked by default on Season 4 update
Mark VI	Complete Legend Commendation	Unlocked by default	N/A
Raider	Classified Requiem Archive I archive	Unlocked by default	DSTT	Classified Requiem Archive II archive	Unlocked by default on Season 4 update
Deadeye	Pre-order Halo 4 from Best Buy or Play.com	Unlocked by default	N/A
Locus	Pre-order Halo 4 from MightyApe.co.nz or HMV.com	Unlocked by default	N/A
Scanner	Buying the War Games Map Pass	Unlocked by default	N/A
Strider	Buying the War Games Map Pass	Unlocked by default	N/A
FOTUS	Buying Halo 4 Limited Edition Console	Unlocked by default	N/A
Mark V	Buying the Infinity Armor Pack or the Champions Bundle	Series 7, Tier 2 ( 1)	N/A
ODST	Buying the Infinity Armor Pack or the Champions Bundle	Series 7, Tier 68 ( 1)	N/A
Prefect	Buying the Infinity Armor Pack or the Champions Bundle	Series 7, Tier 36 ( 1)	N/A
Ricochet	Buying the Bullseye Pack or the Champions Bundle	Series 7, Tier 18 ( 1)	HMTM	Buying the Bullseye Pack or the Champions Bundle	Series 7, Tier 18 ( 1)
Keystone	N/A (MCC-exclusive)	Series 7: Elite, Purchase in The Exchange ( 0)	N/A