What are the Benefits of being in a Clan or having an Alliance?
Edit_01: Wonder if it will be like Halo 2, with Clan specific Matchmaking and Ranking. In which case it would be cool if there was Armor and Weapon unlocks specific to or more easily attainable through Clan Matches. Or Harder Modes, greater XP sharing, shared Storage, the ability to set challenges for Clan Members to earn a Rank within the Clan. Custom Emblems and Expressions.
Edit_02: So if I already have a facebook group for my pub stomping "clan", is there a reason for to have a Bungie Clan/Group?
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If you want achievements/trophies, then yes, you need a clan.