What is the main purpose of the Posse Comitatus Act?

• A. Prohibits regular Army from acting as domestic law enforcement
• B. Prohibits the Army from engaging in any combat operations
• C. Prohibits the use of federal troops in any foreign conflict
• D. Established a federal police force within the Army

Answer: (A)

The main idea being tested is how the military is kept from acting as domestic police. The Posse Comitatus Act restricts the regular Army from serving as a domestic law-enforcement arm or performing civilian police duties inside the United States unless Congress or the Constitution authorizes it. This preserves civilian control over law enforcement and prevents the military from being used as a standing police force at home. It does not bar military action abroad or combat operations overseas, and it does not create a federal police force. The act originated after the Civil War to limit military involvement in internal affairs and has since been interpreted to limit use of federal troops for domestic policing, with official authority for such roles existing only in special circumstances (like those authorized by law or the Insurrection Act).