The first branch of the Onmitsukidō. It is ranked the highest of the five branches in the division. The Executive Militia carries out missions that involve combat. They specialize in the unarmed combat technique known as Hakuda and is able to operate silently and in secrecy. Their responsibilities including punishment and assassination of ex-comrades who break the law and acting as scouts during battle against Hollows. Its members are dressed all in black and are known for their cold-bloodedness. It is normally headed by the the Commander-in-chief of the Onmitsukidō.
Patrol Corps: The second branch of the Onmitsukidō. The Patrol Corps is assigned mainly to the Seireitei area and gathers data on uprisings. In the event of those under house arrest escaping they also are tasked with finding and apprehending them. Externally they patrol the various lands and dimensions to combat dangerous Hollows and other enemies of Soul Society.
The third branch of the Onmitsukidō. The Detention Unit is responsible for the imprisonment and supervision of all criminals within the Seireitei. They also have another duty known as Special Detention, which concerns those who joined the Gotei 13 but were judged to be a danger to their fellow Shinigami. They investigate, apprehend, and keep these individuals sealed away from the rest of Soul Society within the Special Underground Detention Facility, aka. the Nest of Maggots. It should be noted that those few who are kept in the Maggots' Nest have not actually committed any crime but have been identified by the laws of Soul Society as "Dangerous Elements". This unit acts somewhat similar to a prison and mental rehabilitation center. The activities of this division are shrouded in mystery and remains virtually unknown to the majority of the public as well as most Gotei 13 members up to the level of Lieutenant.
Reversal Counter Force: The fifth branch of the Onmitsukidō. The Reversal Counter Force serves as the communication link for division members. A special ops unit that is mobilized whenever a mission is urgent and requires secrecy. Many of its members are masters of Shunpo.