Thanks DJ^TuRKiYe for the heads up in BPN.
If you've had the opportunity to glance through the 2003 Guiness Book of World Records, you may have noticed on page 177, a large picture of the Master Chief taking up half the page. Although no other mention of Halo is made, the caption reads that the Xbox holds the record for most powerful game console. Of course, what better way to illustrate the point than a massive picture of the Chief?
News source: Halo: Truth and Reconciliation