According to this document, you can-t quit. Ever. Therefore I have a little job I know you-ll enjoy. Repair job. The Centauri beacon has shut down. It-s a Mark III beacon.— What kind of beacon? Mark III - The Old Man repeated, practically chortling. - ...This was the earliest type of beacon ever built-by Earth, no less. Considering its location on one of the Proxima Centauri planets, it might very well be the first beacon.