mmm tasty, Bungie just released their new website look along with some Reach Features.
The nameplates are now unlockable and when I viewed my page of name plates I had over 10 different one to choose from.
I have the rare MJOLNIR Mk VI Emblem as well. The funny part about this emblem is its the same one I use for my guy in halo 3 all the time lol. The description for this one reads it as follows:
Reserved for our most steadfast fans. Unlock the Halo 1, Halo 2, Halo 3, Halo 3: ODST, and the Halo: Reach emblems to earn the Master Chief's MJOLNIR Mk VI helmet nameplate.Gunna pwn newbs and let them know I've been around since the beginning =) You can't be a true fan if you haven't started the series at Halo CE . . . well you can be a fan but not a legit one at least. I'm glad Bungie is giving a tip of the hat to their most dedicated players who were fans before even online multiplayer of the series began with Halo 2.
Also the other rare ones I've unlocked:
Bungie Pro Member is Pro:

Beta player for Reach gets the Beta:

Original Halo fan, the true player of halo

First to use the BR, and witness Halo become an online phenomenon:

Finished the Fight, the best fight a game has ever had to offer:

Before Reach Firefight was ODST Firefight where it all began:

Witnessed the complete Trilogy, saw it through to the end and then some:

These last two are the default ones that anyone can have, (AKA bad players and newb status in the Halo Realm)
Bad players would be bad, not even linking their GT, Probably never even played Halo, oh well they are gunna die in Matchmaking . . .

The sporadic non Halo player would use this, not a true player and definitely only going to be playing for awhile until another game rolls around. Sure they linked their gt but its the default one. If they seriously have no other nameplate unlocked it just shows they haven't been around long.