Earn the "Double Whammy" achievement in the single-player campaign mode of Call of Duty: Black Ops with this gamer's guide! In order to unlock this achievement, you will need to destroy both helicopters with one Valkyrie missile from the deck of the ship.
Call of Duty 7 (COD: BO) is the seventh installment in Activision's popular Call of Duty series of military-themed first-person shooter video games and the first to be set during the Cold War. COD7 is available for the PC, Xbox 360, PlayStation 3 (PS3) and Nintendo Wii.
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