The Sangheili home world, Sangheilios, is not featured in Halo 3, or in any other Halo game. It is only mentioned by Rtas 'Vadum when talking to Arbiter Thel 'Vadam.
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There is no Brute armor in Halo 3, only Elite and Spartan models.
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No.
You have to be an "Elite."
certain achievements give it to you
The forerunner planet is what Master Chief drifts forward to in the legendary ending of halo 3.
Yes, the elite can play Halo: Reach as long as it's the Xbox 360 version. I don't think the PlayStation 3 has Halo, but I'm not sure.
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No, only elite's.
you will get elite flight armour
I assume you are asking if you can customize your Elite armor in Halo 3 multiplayer to include the katana? No you cannot.