The UCR Black Knight (Battle-12/BBG-421) was the last of the Mk. I Island class Battleships. It is the most famous for its role in the Adventure Groups actions. Originally the Black Knight was flagship of Task Force Raven following a devestating attack on the UCR capital. She was heavily damaged during a mission when Black Knight had to transport Zack, a highly dangerous monster and scuttled. All of her important UCR components were destroyed.
Several years following the scuttling, the carrier was found by UEG forces in good condition and taken in for salvage. The ship still sat in a boneyard for many years until it would finally be restored. It only saw action during the Defense of Earth against the ships former owners and Exon, now a major ally. Today the Black Knight mainly serves as an training ship. In order to function as a training ship, the Black Knight had to be modernized to appear similar to newer Mk. II class and fitted with some reverse engineered UCR systems.
Following an attempt at adding new systems into the UNSC Black Knight, HIGHCOM reappropriated the funding and resources away for more inportant uses. As of 2580 the Black Knight had been put in mothabll and will either be scrapped, used for target practice or converted to a museum ship.