Of course, this collaboration works both ways. Mountain Dew will appear in Peace Walker as well as an in-game item. The press release says that the appearance of real items in the game "enhances the affinity between the real world and the game's story." It also enhances the affinity between Konami's coffers and cash money. Of course, Metal Gear is no stranger to merchandise tie-ins, with everything from Calorie Mate to Playboy Magazine appearing in the games.