The accidental creation of Call of Duty's iconic map, Shipment.

TL;DR
Shipment, one of the most iconic maps in the Call of Duty franchise, was never meant to be included in the game, according to developers at Infinity Ward. Originally designed as a split-screen map, it was used for internal tests during the development of Modern Warfare and was accidentally left in the game's playlist script. Since its debut in 2007, Shipment has become one of the most popular maps in the franchise, making appearances in five other mainline CoD titles.
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