You need to be a brigadier and have 300,000 credits
That would be the MJOLNIR Mk. VI helmet, at 300,000 credit.
The Mark VI helmet is unlockable at the rank of Brigadier, and costs 300,000cr. It can first be seen at the rank of Colonel.
Just keep leveling up your spartan, but to get the mark VI helmet you have to be a colonel. So go try it out.
300 000 cr and you need to be a briadier
you have to be a brigadier to unlock master chiefs helmetthe cost is 300,000cr so save up at colonelAt the rank of Brigadier online, you may purchase the Mark VI helmet for 75,000 cR in the armory.
Mark V Helmet - Lt. Colonel, 130,000 cR Helmet Upgrades for Mark V - CNM - Lt. Colonel, 10,000 cR UA - Lt. Colonel, 15,000 cR Mark V Shoulders - Left - Brigadier, 100,000 cR Right - Brigadier, 80,000 cR Mark VI Helmet - Brigadier, 300,000 cR Shoulders- FC-I[2] - Brigadier, 75,000 cR UA/HUL-I - Brigadier, 75,000 cR
get all mini kits on the fight lord sidious level (VI)
Technically speaking, all the helmets in the armory are Spartan helmets. If you mean the specific helmet worn by Master Cheif in Halo 3, the MJOLNIR MK. VI, then that costs 300,000 credits.
In any of the menus (except the in game menu) you press start and move the left control stick to the right and then you should find something that says customize character or something. For the spartan you start off with the MARK VI and CQB helmet, shoulders and chest. For the elite you start with the combat and assault helmet, shoulders and chest. you can unlock more armour for your spartan and elite. for example to get the ODST helmet you have to get the first badge. i cant remember what is called but it is silver with to battle rifles crossed. (note this is for the xbox 360)
If you beat it on legendary, co-op or solo, you unlock the spartan VI armor.
you just go into a secret tunnel hidden in the ground.
Complete VI and buy him at the bar.