Grenadier Armor

The Grenadier variant's design originates from the first prototypes of the Mark IV helmet, albeit one that was upgraded to withstand violent concussive force.

Blast Deterrent
Prototyped just over a decade after the first line of Mark IV was activated, the Grenadier Variant of MJOLNIR includes an up-armored helmet configuration with heads-up software that adjusts to combat situations to improve a grenadiers performance and survivablity. Howeve, Mark IV Grenadier only saw limited use by Spartans, as other, more widely distributed varients filled this same role.

Trivia

 * As late as 2552 the Grendier Variant was still used by Jorge-052, the only member of Noble Team present when the original Mark IV was activated.
 * Even after the events of November 27, 2525, when the UNSC Commonwealth faced of against the Covenant's Unrelenting  in defense of the Damascus site (the source of Grenadier), the Materials Group has held their ground at this facility well into the war.
 * In Halo: Reach, players ranked Warrant Officer can buy the Grenadier helmet from the Armory for 25,000 credits.