Halo 3 Odst multiplayer disc armor?

[Luke]

I just got Halo 3 odst and I was looking up how to unlock armor for multiplayer. I saw that you have to have Halo 3 to unlock the armor... I was wondering if there is any way to get the armor with Halo 3 odst, because I don't have Halo 3
Not just Recon Armor, all the other armors

 

[IchBinGod]

You don't have to have Halo 3 to unloch it.
Just beat the game on legendary once