Arca Company Barracks was the barracks belonging to Arca Company, at which Omega Squad and many other clone troopers stayed while on Coruscant. The Nulls took it over on the return from Geonosis, refusing to be put into stasis tubes after no one could command them during the battle. The six of them held it against the CSF until Kal Skirata arrived, and talked them into ending the siege; Kal was re-enlisted in the Grand Army and the Nulls had no disciplinary action taken against them.  The Special Operations Brigade was stationed here, with Jedi Masters Iri Camas and Arligan Zey maintaining offices within.
- Republic Commando: Triple Zero
- Republic Commando: True Colors
- Order 66: A Republic Commando Novel
- Imperial Commando: 501st