The DSC-304, also known as the Daedalus-class or simply 304, is a class of deep space carrier built by Earth, and the most abundant series of vessels in their fleet. Replacing the BC-303 as humanity's frontline battleship, it has seen extensive action against various foes in several galaxies, and with modern refits of Asgard weaponry, they are among the most-powerful ships of their size. Following the complete devastation of Earth in the Der'kal Invasion, the number of DSC-304s dropped dramatically, but the line was revitalized when the planet was retaken, and Daedalus-class ships continue to be a common sight wherever the Tau'ri have a presence.