I doubt there would be much armor missing from REACH since that's where all things spartan originate. If you meant the mark V (5) like in Halo: CE (1) just look at RedVsBlue.com and watch "Deja view" the first episode in the halo reach mini and look at "Caboose" wearing the mark V. I don't think I've seen/heard of a mark 4 yet...
Most armor is unlockable by rank, then made buyable with credits. Some of the halo reach armor is unlocked via halo waypoint (downloadable in xbox dashboard). Other armor such as the flaming helmet are unlocked from a code that comes with certain sets of the game. ( legendary edition, pre-order, etc.
Death Knight armor is unlockable from Artix in Doomwood/Necropolis, after you complete the quest chain. You will need to have unlocked Paladin and Necromancer first, the Death Knight armor is trained in the same way.
We can not answer. You must have had to pr order halo reach to get elite officer armor.
No, there is no Hayabusa armor in Halo Reach.
You simply have to reach the appropriate ranks. The Elite armor does not cost any extra cR.
There is two ways to get it #1 unlock all of the armor #2 is to become the highest rank in halo reach
There is no way to get and different armor for Elites in the BETA.
sadly, no it does not.
granadier
yes
his helmet is a grenadier
The armor is purely cosmetic. It's only for looks