you can't unless you bought the game on the day of release or pre-ordered
Chat with our AI personalities
Commander
you have to be a bungie member.
his helmet is a grenadier
I think all you have to do is advance to rank "captain." [xXMateoXx] - Unless you buy the limited or legendary edition of the game in which case you full the full recon helmet, flaming helm armor effect, elite armor, falcon avatar item, an tons more stuff depending on which edition you bought.
He is wearing the Commando helmet that you unlock by ranking up.