When older gamers think of Call of Duty, they probably recall Call of Duty 4: Modern Warfare and screeching 10 year-olds on Xbox Live. The thing is, that game came out in 2007. Those same screeching ten-year-olds are now beer-chugging 24-year-olds, and it’s a fair bet that a lot of them are still playing Call of Duty. Upcoming title CoD:Vanguard