The Military Police Brigade is one of the three main branches of the military in the world of "Attack on Titan." It is an elite and prestigious military organization responsible for maintaining law and order within the innermost Wall, Wall Sina.
The primary role of the Military Police Brigade is to protect the ruling class and the royal family. Their duties include guarding the king and other high-ranking officials, conducting investigations, and maintaining peace and order within the capital and its vicinity.
Unlike the more active and combat-oriented Survey Corps or the defensive Garrison, the Military Police Brigade is often seen as a less rigorous and less perilous branch of the military. Its members are known for their relatively comfortable lifestyle compared to those in other branches.
The Military Police Brigade recruits individuals from the top graduates of the training corps, selecting those who display exceptional skills and potential. However, corruption and abuse of power within the Military Police are prevalent, with some members more interested in personal gain and luxury than in their actual duties.
While the Survey Corps and the Garrison face the brunt of the danger from Titans and external threats, the Military Police Brigade focuses on maintaining order and protecting the interests of the ruling class within the confines of Wall Sina.
The role and actions of the Military Police Brigade become significant in the series, as its members often find themselves entangled in the complex political landscape and conspiracies surrounding the truth about the Titans and the world beyond the Walls.