I personally like the EOD but most people don't.
There is no hayabusa helmet in halo reach
probably the haunted helmet but you have to first have 100 percent armory completion for it to become able to purchase (personally i think that the gungnir helmet looks the coolest though)
Please be more specific next time. If you mean halo 3 mission, the coolest would be the last one, Halo, because everyone is blowing up. If you mean "Is halo 3 the coolest Halo game?" no, Halo Reach is.
the commando helmet
There's no code for the helmet.
Do a bulltrue in matchmaking to unlock the avatar award.
Any preorder of Halo: Reach will get you the Recon Helmet for free use in Halo: Reach ONLY. If you preorder the Legendary Edition you will receive the Bungie flaming helmet.
Work for bungie, or buy the legendary edition of halo: reach.
that does not exist
his helmet is a grenadier
This is impossible to do.
Nike just do it!