The Gotei 13 Rules and Info

The Gotei 13 (護廷十三隊, Goteijūsantai; 13 Division Imperial Guards, 13 Court Guard Squads in the English dub, 13 Court Guard Companies in the English manga) is the primary military branch of Soul Society. It is also the main military organization that most Shinigami join after the academy.

History
The History of the Gotei 13 is somewhat unknown. All that is currently known is that it was founded by the current Captain-Commander Genryūsai Shigekuni Yamamoto.

Mission
The Gotei 13 serves as a military force with its primary responsibilities consisting of:

■The defense of the Seireitei, the center of Soul Society.
■The deployment of Division members into enemy territory for combat operations.
■The deployment of Task Forces as defensive measures in the world of the living.

General Operation
The Gotei 13, in contrast to the normal operations of modern-day militaries, does not operate as a cohesive unit normally. The command of the divisions are generally left to the discretion of its particular Captain, who commonly runs it whatever way he or she sees fit, allowing for the change of a division's traditional duties to an entirely new set and even the creation of a separate institution connected to the division. The Gotei 13's main duty is to defend the Seireitei but they are also allocated districts in Rukongai to defend. In addition to these duties, Shinigami also have to deal with the business of being assigned to the Human World.

The only general authority to call forth a combined front would be that of an edict from the Central 46 Chambers, or more often the Captain-Commander. It is not uncommon for captains to not see each other as a whole group for long periods of time, except for cases involving a threat to all of the Soul Society, a captain's punishment, or to a lesser degree, a captain's promotion. On a regular basis, the captains are spread out all across the Soul Society doing their divisions' duties, whatever they may be. They are, in fact, so far spread out that getting the Captains together as a group, or even getting their lieutenants together as a group, could normally take a day to accomplish.

Unless specifically ordered by the Captain-Commander, captains can choose whether or not to attend meetings (at their own risk) or not even involve themselves in the daily situations of the Soul Society. Captains are not allowed, without permission, to carry out activities outside of their normal jurisdiction or their division. The captain of one division cannot punish the subordinates of another captain.

Officially, the Kidō Corps and Onmitsukidō are not part of the Gotei 13. However, as Suì-Fēng is both the captain of the 2nd Division and the head of the Onmitsukidō, the Onmitsukidō is effectively under Gotei 13 control. In addition, the captain of the Kidō Corps has been known to obey summons and orders from the Captain-commander of the Gotei 13.