The Jar-Keurog was a Jung Battleship and later as Earth Defense Force orbital spaceport, production facility as well as a battle station over Earth.
After the Jung conquest of Earth Jar-Keurog was stationed in orbit in order to hold the planet and was later used in nuclear orbital bombardment of earth population center, to force the Aurora to surrender. In the ensuing battle Keurog's was heavily damaged and captured by Aurora's Ghatazhak. The Jar-Keurog propulsion systems was deemed irrecoverable, so it was decided to use it as orbital spaceport, production facility as a replacement to earth's lost Orbital Assembly Platform and utilizing its massive weapons as to protect Earth.