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In halo he wears mark 1 armor in halo 2 he wears mark 2 armor
A Spartan wearing Mjolnir armor weighs about half a ton total.
It's called the MJOLNIR mark V armor. It's supposed to be a reference to old Norse Mythology.
In the newer iterations of the Halo series (i.e. 2 and 3) It's MJOLNIR mark 6 armor.
ODST armor is similar in a sense, but is not the same.
Armor Battle happened in 1979.
Armor Battle was created in 1979.