The Green Lantern Corps is the name of a fictional intergalactic military/police force appearing in comics published by DC Comics. They patrol the farthest reaches of the DC Universe at the best of the Guardians, a race of immortals residing on the planet Oa. According to DC continuity, the Green Lantern Corps has been in existence for three billion years, surviving multiple conflicts both internal and foreign. Currently operating divided as pairs amongst the 3600 "sectors" of the universe, there are 3600 members, one lantern for every sector (known commonly as Green Lanterns) are estimated to be serving within the Corps.
Each Green Lantern is given a power ring, a weapon granting the use of incredible abilities that are directed by the wearer's own willpower.The Corps is an organization of 7200+ Green Lanterns (the old Corps was composed of 3600) who are chosen by the ring for being able to overcome great fear, with two assigned to each sector of space that require the protection of more than one Green Lantern (Earth, home to Hal Jordan and John Stewart, are in Sector 2814). Heavily populated Sectors like 2814 can have several Lanterns. While the primary Lanterns of Sector 2814 are Hal Jordan and John Stewart, Kyle Rayner and Guy Gardner call Earth home, but are stationed on Oa, first as teachers, and then specially assigned to cases that are too difficult for the average lantern. The official number of active Lanterns apparently does not include backup members who are kept in reserve to be called to active duty on short notice in the event that the regular Lantern in their particular sector is not available.
In the original organization, the active list was apparently kept at a strict maximum considering John Stewart was not mobilized during the Nekron crisis despite the situation's dire nature, as opposed to Guy Gardner who was medically unfit for duty at that time. Despite the vast number of Green Lanterns, certain sectors of space apparently do not recognize the authority of the Corps, as alien superhero Icon claims that his status as a citizen of the interstellar civilization known as the Cooperative makes him immune to prosecution from Guardians or their agents.
The Green Lantern's Oath is, In brightest day, In blackest night, No evil shall escape my sight, Let those who worship evil's might, beware my power Green Lantern's light!
