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Aguided-missile destroyer (DDG) is adestroyer whose primary armament isguided missiles so they can provideanti-aircraft warfarescreening for the fleet. The NATO standard designation for these vessels isDDG, while destroyers which have a primary gun armament or a small number of anti-aircraft missiles sufficient only for point-defense are designatedDD. Nations vary in their use of destroyerD designation in their hull pennant numbering, either prefixing or dropping it altogether.
Guided-missile destroyers are equipped with large missile magazines, with modern examples typically havingvertical-launch cells. Some contain integrated weapons systems, such as the United States’Aegis Combat System, and may be adopted for use in ananti-missile or ballistic-missile defense role. This is especially true for navies that no longer operatecruisers, so other vessels must be adopted to fill in the gap.
Many guided-missile destroyers are also multipurpose vessels, equipped to carry outanti-surfaceoperations withsurface-to-surface missiles andnaval guns, andanti-submarine warfare with torpedoes and helicopters.




Although the French Navy no longer uses the term "destroyer", the largest frigates are assignedpennant numbers with flag superior "D", which designates destroyer.






