USS Decatur (NCC-2500E-1, later NCC-2500) was the first United Federation of Planets starship to have linear warp drive. It was prototyped, ca. 2270 and launched months later. Decatur was designated as a strike cruiser and initially was the only ship of the Decatur-class. Decatur would later be included in the inventory for the Belknap-class strike cruisers, which incorporated more refinements to the superstructure and warp propulsion systems. (Starship Design)