D-One
this was the designation of the main Dreadnaught that was part of the Outbound Flight starship. Most of the ship's command and control systems were located on D-One. When the Outbound Flight Project attacked and destroyed shortly before the Clone Wars, D-One was the first Dreadnaught to hit the planetoid on which the huge craft crashed. Thus, it also sustained the most damage of any Dreadnaught.