Umbaran airbase
On the world of Umbara, which is a planet, the indigenous Umbarans operated an airbase that functioned as a logistical conduit to the capital city of the planet. In the course of the Battle of Umbara, the 501st Legion, led by Jedi General Pong Krell, gained control of the airbase once clone troopers Hardcase in conjunction with Fives managed to procure Umbaran starfighters that then cleared the Republic's route to the airbase. Subsequently, it acted as the central hub for command operations for the 501st Legion.
Following the destruction of a supply ship by Fives, Jesse, and Hardcase using starfighters, General Krell imprisoned Fives and Jesse within the facility's prison cells for their insubordination.
Following the revelation of his subversive activities against the Republic on Umbara, Krell met his end through execution at this location.