Which of the following ships is not classified as a destroyer?

Destroyers are a class of warship designed primarily for escorting larger vessels in a fleet, engaging in anti-submarine warfare, and providing a quick reaction to threats. The classifications of ships are based on a combination of their roles, capabilities, and sizes.

The correct classification that does not represent a destroyer is the one associated with the class identified by FFG. The FFG stands for Frigate, which is a different class of warship typically smaller than a destroyer, and designed to primarily protect other ships and perform anti-submarine duties, but not with the same level of firepower or multi-role capacity as a destroyer.

Destroyers like those labeled as DDG (Guided Missile Destroyers) or DD (Destroyers) are more heavily armed with a focus on offensive operations, while CG (Cruisers) are larger ships that provide significant air defense and long-range missile capabilities. In summary, frigates fulfill a distinct naval role that separates them from destroyers, making it clear that FFG is not classified as a destroyer.