Introduction
This article compares the military justice systems of the United States and Canada, focusing on legal foundations, court structures, prosecutorial arrangements, rights, and oversight. Military law reflects each country’s constitutional framework and civil-military balance, so similar terminology can mask different allocations of authority and review. All statements are anchored to October 2025 and emphasize verified institutions and statutes. Where public figures vary, approximate ranges are used. The aim is descriptive clarity rather than evaluation, explaining how each system organizes investigation, charging, adjudication, appellate review, and the interface with civilian courts. The discussion proceeds from country descriptions to a structured comparison, followed by concise force overviews, cautious estimates of legal personnel where possible, and a closing sources section.
United States Military Law
The United States system is governed by the Uniform Code of Military Justice (UCMJ) and implemented through the Manual for Courts-Martial. Jurisdiction covers active-duty personnel worldwide and certain reserve and retired categories. Trial forums comprise summary courts-martial for minor offenses, special courts-martial for intermediate matters, and general courts-martial for the most serious crimes. Appellate review proceeds through the service Courts of Criminal Appeals to the U.S. Court of Appeals for the Armed Forces (CAAF), with limited U.S. Supreme Court review. Rights include advisement under Article 31(b) and access to military or civilian defense counsel. Since late 2023, specified serious offenses are investigated and charged by independent Offices of Special Trial Counsel (OSTC), which make disposition decisions outside immediate command chains while commanders retain responsibilities for good order and discipline.
Canada Military Law
Canada’s system is created by the National Defence Act (NDA) and the Code of Service Discipline (CSD). Persons subject to the CSD may be tried by Summary Hearings for disciplinary infractions or by courts-martial for service offenses. Courts-martial sit in two formats: the Standing Court Martial for single-judge trials and the General Court Martial for judge and panel cases. Appeals go to the Court Martial Appeal Court of Canada (CMAC), with further appeal to the Supreme Court of Canada on leave. Prosecution is conducted by the independent Director of Military Prosecutions (DMP) within the Office of the Judge Advocate General (JAG), while defense services are provided by the Director of Defence Counsel Services (DDCS). Investigations are led by the Canadian Forces National Investigation Service (CFNIS) within the military police, with referral protocols to civilian authorities for defined categories of …