Because his number is 117.
[spoiler]For all the mathematicians out there who are on the verge of a heart attack induced by the title - "Master Chief is 110 more than James Bond" just did not have the same ring to it. You may now rest in pepperoni salami zucchini. kthxbai.[/spoiler]
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Until the MC gets female characters with names like "Pussy Galore"? He's going to be lacking in one vital area. K/D isn't always the most important scoring metric.