www.bungie.net | halo.bungie.net | bungiestore.com
Don't know if this has already been posted here but according to xbox.com, Halo is rated T in x-box. Here is the link. By the way if you wanne check out the entire video you can, but the part to which I am referring to is the last few seconds in the video.
If you watch the theatricle trailor it says "Rated 'M' for mature"
Looking For a Clan? Go look for it here.The Rules
It states Teen.
I believe Halo was originally supposed to be teen, but changed at last minute to mature.
I've noticed for a lot of games that different advertisments often show different ratings. Super Smash Bros. Melee was rated E, then T, then E, then finally T again. (well, just based on the ads i saw.)