Definition
Military courts are tribunals established under the authority of the legislative and executive branches to adjudicate matters arising under military law, primarily offenses committed by members of the armed forces. They operate outside the ordinary Article III federal court system and derive their authority from Congress's constitutional power to govern and regulate the armed forces.
The term encompasses several distinct institutions:
1. Courts-Martial. The primary criminal tribunals of the military justice system. Convened under the Uniform Code of Military Justice (UCMJ), courts-martial try service members accused of offenses defined in the UCMJ. Three tiers exist: summary, special, and general courts-martial, corresponding roughly to minor, intermediate, and felony-level proceedings.
2. Courts of Criminal Appeals (Service Courts). Intermediate appellate bodies within each military branch — the Army, Navy-Marine Corps, Air Force, and Coast Guard Courts of Criminal Appeals — that review courts-martial convictions meeting threshold criteria.
3. United States Court of Appeals for the Armed Forces (CAAF). A civilian Article I court sitting atop the military appellate structure. Its judges are civilian presidential appointees; its decisions are subject to discretionary review by the U.S. Supreme Court.
4. Courts of Inquiry. Fact-finding tribunals convened to investigate incidents or conduct. They do not themselves impose punishment but may generate findings used in subsequent proceedings.
5. Military Commissions. Ad hoc tribunals convened to try unlawful enemy combatants and, historically, war criminals and spies. Distinct from courts-martial in jurisdiction, procedure, and constitutional standing. Their authority rests on the laws of war and, in modern practice, statutory authorization.
Common Confusion
Military courts are frequently conflated with courts-martial, but courts-martial are one type of military court. The umbrella category includes courts of inquiry, military commissions, and the appellate structure above courts-martial. The distinction matters in research: historical sources may use "military court" loosely to mean any of these, while modern statutory and constitutional analysis draws sharp lines between them — particularly between courts-martial (governed by the UCMJ) and military commissions (governed by separate statutory authority and subject to distinct constitutional constraints).
Military courts are also sometimes confused with martial law tribunals. Martial law involves military governance of civilian populations during emergencies; military courts ordinarily exercise jurisdiction over service members and, in limited circumstances, specified civilians — not the general population.
Recognized Forms
/SUBTYPES
— General Court-Martial: Highest tier; tries serious offenses; may impose any lawful sentence including death.
— Special Court-Martial: Intermediate tier; limited sentencing authority.
— Summary Court-Martial: Lowest tier; single officer; minor offenses; limited to enlisted personnel.
— Court of Inquiry: Investigative, not punitive.
— Military Commission: Jurisdiction over unlawful enemy combatants and law-of-war violations.
— Service Courts of Criminal Appeals: Intermediate appellate review within each branch.
— United States Court of Appeals for the Armed Forces (CAAF): Apex Article I appellate court.
Why It Matters in Research
The term "military courts" has never been fully stable. Historical sources — including Black's Law Dictionary — use it as a general label covering courts-martial, courts of inquiry, and courts of chivalry, without distinguishing their constitutional foundations, procedural rules, or jurisdictional scope. A researcher reading nineteenth-century materials must determine from context which institution is meant.
The constitutional status of military courts has been contested across American history. The foundational question — whether military tribunals adjudicating criminal matters must conform to Article III requirements (life tenure, salary protection, jury trial) — has generated durable tension that early dictionary sources do not resolve. Military courts are Article I courts, insulated from those requirements, but the outer boundary of their jurisdiction over civilians and former service members has shifted through legislation and Supreme Court decisions.
Military commissions present a distinct research challenge. Their historical roots predate the Republic — Black's notes their first documented American use by General Scott in the Mexican War — but their legal architecture, constitutional grounding, and procedural requirements have changed dramatically, especially after the early twenty-first century. Researchers working on commissions must track parallel statutory developments alongside the case law.
Appellate structure is a modern development largely invisible in historical dictionaries. The current layered system — Service Courts of Criminal Appeals, CAAF, and potential Supreme Court review — did not exist in its present form until the latter twentieth century. Early sources describe courts-martial as largely self-contained, with limited civilian judicial oversight. That picture is substantially outdated.
For corpus researchers: the Bouvier's entry for this term is essentially a dead end, redirecting to a separate entry (likely COURT-MARTIAL) without substantive content. Black's offers the more useful historical snapshot, though its treatment is thin. The encyclopedia entries at military_7 and constitutional_153 provide the structural detail that the historical dictionaries omit.
Jurisdictional reach is a persistent research trap. Military courts do not have universal jurisdiction over all persons on military installations, and their jurisdiction over civilians has been substantially curtailed since the mid-twentieth century. Sources predating modern UCMJ interpretation may overstate military court authority.
Historical Dictionary Support
Black's Law Dictionary takes the broadest definitional approach, treating "military courts" as the general name for all tribunals exercising military jurisdiction — listing, for England, the court of chivalry and courts-martial, and for America, courts-martial and courts of inquiry. This framing is historically accurate but analytically thin by modern standards: it treats the category as self-evident rather than tracing its constitutional or statutory foundations.
Black's most valuable historical observation concerns military commissions specifically. It notes that commissions are "probably not known outside of the United States" and credits their first American use to General Scott during the Mexican War — a point of genuine historical significance, sourced to the American and English Encyclopedia of Law. This is a rare moment where the historical dictionary adds information not easily recovered from modern sources focused on contemporary doctrine.
Bouvier's, as the source material reflects, offers nothing substantive on military courts directly, redirecting readers to what was presumably a COURT-MARTIAL entry. This gap is itself informative: Bouvier's nineteenth-century framework did not treat military courts as a category requiring independent treatment, reflecting a legal culture in which courts-martial were the dominant — and largely self-sufficient — military tribunal.
Neither historical dictionary addresses the appellate architecture, civilian judicial review of military convictions, or the constitutional status of military commissions under modern law. Researchers relying solely on these sources will have a partial and, in places, misleading picture.
Jurisdictional Note
Military courts derive jurisdiction from federal law and apply uniformly across the United States military regardless of where a service member is stationed, including overseas. State courts have no jurisdiction over UCMJ offenses. Jurisdiction over civilians attached to or accompanying military forces in the field, and over discharged veterans, has been the subject of significant litigation and should not be assumed from historical sources.
Encyclopedia Cross-Reference
military_7: Military Appeals — Service Courts of Criminal Appeals, CAAF, and Supreme Court Review (The Law Mind Military, Veterans & Admiralty Law Encyclopedia)
constitutional_153: Civil War Amendments and Military Justice — Courts-Martial and Service Members' Rights (The Law Mind Constitutional Law Encyclopedia)
military_12: Military Records Correction — BCMR/BCNR, Exhaustion, and Federal Court Review (The Law Mind Military, Veterans & Admiralty Law Encyclopedia)