Article 91 of the Uniform Code of Military Justice, codified at 10 U.S.C. 891, is a single federal statute that applies uniformly across all the armed forces. It prohibits warrant officers and enlisted members from striking or assaulting, willfully disobeying the lawful order of, or treating with contempt or disrespect a warrant officer, noncommissioned officer, or petty officer in the execution of office. The substantive law is the same whether the accused is a Soldier, a Sailor, or an Airman. What differs between the services is not the text of the offense but the way each service investigates, processes, and dispositions these cases. Understanding those differences requires distinguishing the law itself from its enforcement.
The statute and its elements are identical across services
Because Article 91 is part of the UCMJ, which Congress enacted to apply to the entire military, the elements a court-martial must find are the same in every service. The Manual for Courts-Martial, which supplies the elements and explanations for the punitive articles, is also a single document used across the Department of Defense, so the definition of disrespect, the knowledge-of-status element, and the lawfulness analysis for orders do not change from one service to another. A disrespect-toward-an-NCO case is built on the same legal foundation regardless of branch.
Who is protected: NCOs versus petty officers
The most visible service-specific feature is terminology and rank structure. The Army, Marine Corps, and Air Force use noncommissioned officers, while the Navy and Coast Guard use petty officers as the corresponding enlisted leaders. Article 91 expressly protects warrant officers, noncommissioned officers, and petty officers, so the statute is drafted to cover all of these categories. In practice, an Article 91 charge in the Navy will typically involve disrespect or disobedience toward a petty officer, while in the Army or Air Force it will involve a noncommissioned officer. The legal effect is the same; only the title of the protected person differs.
Nonjudicial punishment is handled and named differently
A large share of Article 91 conduct, especially lower-level disrespect, is resolved through nonjudicial punishment under Article 15 rather than by court-martial, and this is where service practice diverges most. In the Army and Air Force, nonjudicial punishment is commonly called an Article 15. In the Navy and Coast Guard it is called captain’s mast, or admiral’s mast depending on the rank of the officer presiding. In the Marine Corps it is often referred to as office hours. These are different names for the same statutory mechanism, but the procedures around them are not identical.
One notable procedural difference concerns the right to refuse nonjudicial punishment and demand trial by court-martial instead. Service members generally have that right, but Navy and Marine Corps personnel who are attached to or embarked aboard a vessel do not have the option to refuse nonjudicial punishment. That maritime exception reflects the practical realities of shipboard discipline and does not exist in the same way for the land-based services. The way each service structures the imposing authority and the appeal of nonjudicial punishment also varies according to its own regulations.
Investigative and disposition practices vary by service culture and regulation
Each service runs its discipline system through its own regulations, command structures, and investigative organizations, and each maintains its own implementing guidance for the UCMJ. The threshold at which a command elevates an Article 91 incident from informal counseling to nonjudicial punishment, or from nonjudicial punishment to court-martial, can reflect service-specific policy and the seriousness of the conduct. A minor verbal disrespect might be handled with corrective training or counseling in one unit, nonjudicial punishment in another, and, where aggravating facts exist such as an assault on the NCO or petty officer, a court-martial in any service. These disposition decisions rest with commanders exercising discretion under their service’s regulations, which is why outcomes for similar conduct can look different across branches even though the underlying offense is the same.
Punishment ranges come from the same source
The maximum punishments for Article 91 offenses are set by the Manual for Courts-Martial and scale with the seriousness of the conduct, from relatively modest punishment for verbal disrespect up to substantial confinement and a punitive discharge for striking a warrant officer. Because these limits flow from the Manual rather than from service-specific rules, the ceiling on punishment at a court-martial does not differ by service. What can differ is the actual disposition chosen and the sentence imposed within those limits, which again reflects command discretion and service practice rather than a different law.
Bottom line
Article 91 enforcement does not differ between the Army, Navy, and Air Force at the level of the law. The statute, its elements, and its maximum punishments are uniform across the services because they come from the UCMJ and the Manual for Courts-Martial. The real differences are in vocabulary and procedure: the protected superiors are called noncommissioned officers in the Army and Air Force and petty officers in the Navy, nonjudicial punishment goes by Article 15, captain’s mast, or office hours depending on the service, and shipboard Navy and Marine Corps members lack the usual right to refuse nonjudicial punishment. Beyond that, each service exercises command discretion under its own regulations in deciding how to dispose of a given case. A service member facing an Article 91 matter should consult a qualified military defense attorney familiar with their particular service’s procedures, because the practical path a case takes is shaped by those service-specific practices even though the offense itself is common to all.
Disclaimer
This article is provided strictly for general educational and informational purposes. It is intended to explain how the Uniform Code of Military Justice (UCMJ), the Rules for Courts-Martial, the Military Rules of Evidence, and related military administrative processes work as a matter of public legal education. It does not constitute legal advice, a legal opinion, or a recommendation about any particular case, and it is not a substitute for advice from a qualified military defense attorney who can evaluate the specific facts and command, service, and jurisdictional circumstances involved.
Reading this article, or contacting any website on which it appears, does not create an attorney-client relationship between the reader and any law firm, attorney, or author. Every court-martial, nonjudicial punishment action, administrative separation, and security-clearance matter turns on its own facts, the charged articles, the convening authority, the service branch, and the evidence, and outcomes vary widely from one case to another.
Military law also changes over time. The Military Justice Act of 2016 (effective January 1, 2019) and subsequent National Defense Authorization Acts renumbered and rewrote many punitive articles, revised the Article 32 preliminary hearing, and altered sentencing, clemency, and appellate procedures. Statutes, regulations, executive orders, the Manual for Courts-Martial, and decisions of the service Courts of Criminal Appeals and the Court of Appeals for the Armed Forces may have been amended, superseded, or reinterpreted after this article was written, and article numbers or procedures cited here may have changed.
For these reasons, no reader should act or decline to act based on this content without first consulting a licensed attorney experienced in military justice about their own situation. The author and publisher make no warranty, express or implied, as to the accuracy, completeness, timeliness, or current applicability of the information provided, and disclaim any liability for any action taken or not taken in reliance on it. If you are facing investigation, charges, or an adverse administrative action, time limits may apply, and you should seek qualified counsel promptly.