Intergalactic Space Patrolman

Many members of the Green Lantern Corps are assigned different sectors of the galaxy to patrol.

Heavily-populated sectors can have several Lanterns.

Each member has a great deal of autonomy as to their methods in their jurisdiction, subject to review by the Guardians of the Universe if they feel the Green Lantern in question has abused his/her assigned authority.

The individual Lanterns are responsible for arranging their replacements if they are near retirement or death. If the Lantern dies before that obligation is met, the ring will find and seek another to be trained on its own. In rare circumstances, the Guardians will personally go out into the field to recruit a replacement.