Ark Galactapedia

Corin (Kilian IX) is a mesoplanet in the Kilian system, United Empire of Earth (UEE), owned by the UEE Marines. Located far outside the system's green band, surface conditions on the planet are very dangerous for anyone without protective gear. The Marines maintain an extensive underground base, used as their headquarters and primary training ground. The exact nature of their training is a well-guarded secret, but many believe that the planet's inhospitable environment factors heavily into it. A full Marine battle group patrols the area around Corin at all times to prevent unauthorized access.