Klingon fleet, though it was eventually supplanted by the D5 class. The distinctive silhouette became as much a symbol of the Empire as the Imperial Trefoil itself, and was carried forward into the D6 and D7 classes. Some D4s served into the 2260s; Starfleet included them in Klingon tactical simulations, where they fought alongside the later D7 class against Constitution class vessels.
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