There is a $5,000 prize for the team who wins the D-Day Call Of Duty Tournament presented by ION Gamers. You can read all the details at the ION Gamers website, here is a blurb:
The Official D-Day Call of Duty Tournament is about to kick off at IONGamers and sign-ups are currently open. There's a $5,000 purse waiting for winning teams as well as other prizes like game packs and more, so get your friends together and sign up! The tournament -- sponsored by Activision, presented by Computer Games Magazine, and hosted at IONGamers --kicks off on D-Day (June 6th) with an exhibition match, followed by tournament matches through June 20th.
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News source: FileFront