The Military Police Brigade is the elite military branch responsible for maintaining law and order within Wall Sina, the innermost Wall where the royal family and nobility reside. Only the top ten graduates of each Training Corps class are eligible to join the Military Police, making membership a symbol of prestige and achievement. Under the reign of the false King Fritz, the Military Police served primarily as enforcers for the monarchy's propaganda, suppressing anyone who discovered the truth about the Walls and the Titans. Their headquarters is located in the Stohess District of Wall Sina, and they maintain a public image of disciplined professionals while privately engaging in corruption and political oppression.
The Military Police's official function is to enforce laws within Wall Sina, protecting the aristocracy and maintaining order in the capital region. In practice, under the old regime, they secretly eliminated anyone who discovered the truth about the world beyond the Walls, using their Anti-Personnel Control Squad to silence dissent through assassination and intimidation. They controlled information flow about Titans, the Walls, and human history to preserve the monarchy's grip on power. After the coup led by Erwin Smith and the Survey Corps, the Military Police was reformed and many of its corrupt members were purged. They later participated in the unified defense of Paradis against the Marleyan invasion, contributing their resources and manpower to the island's survival.
Nile Dok was the Commander of the Military Police, a capable if traditional officer who was married to Erwin Smith's former love interest Marie. He initially opposed the Survey Corps but later acknowledged their righteousness and assisted in the defense of Paradis. Kenny Ackerman, the grandfather-like figure to Levi, led the Anti-Personnel Control Squad under Military Police command, developing specialized gear for killing humans rather than Titans. His pursuit of power ultimately led him to serve the Reiss family directly as the founder of the Interior Police, and he later passed on the Titan injection to Levi before his death.