Article 120 of the Uniform Code of Military Justice, codified at 10 U.S.C. 920, defines the principal adult sexual offenses in the military, including rape and sexual assault. Service members and their families often ask whether a conviction under this article carries a mandatory minimum sentence, meaning a punishment that the court-martial and the convening authority cannot go below. The accurate answer is yes for certain offenses, but the nature of the mandatory minimum depends on which offense is involved, and the rule is narrower and more specific than many assume.
Where the mandatory minimum comes from
The mandatory minimum for these offenses is not located in Article 120 itself. It is found in Article 56 of the UCMJ, codified at 10 U.S.C. 856, which governs sentencing generally. Article 56(b) directs that for a defined set of serious sexual offenses, the punishment must include, at a minimum, a punitive separation from the service. For an enlisted member that means a dishonorable discharge, and for an officer it means a dismissal. In other words, a person convicted of one of the covered offenses cannot receive a sentence that omits a punitive discharge or dismissal.
Which offenses trigger the requirement
Article 56(b) lists the offenses to which the mandatory minimum applies. They are rape under subsection (a) of Article 120, sexual assault under subsection (b) of Article 120, rape of a child under subsection (a) of Article 120b, and sexual assault of a child under subsection (b) of Article 120b. The requirement also extends to an attempt to commit any of those offenses that is punishable under Article 80, and to a conspiracy to commit any of those offenses that is punishable under Article 81.
For the purposes of a question focused on Article 120, this means that both rape under Article 120(a) and sexual assault under Article 120(b) carry the mandatory minimum of a dishonorable discharge or dismissal. A conviction for either of those offenses therefore guarantees, at a floor, the loss of an honorable separation from the service through a punitive discharge.
What the mandatory minimum does and does not require
It is important to be precise about what the mandatory minimum actually compels. For the listed Article 120 offenses, the mandatory minimum is the punitive discharge or dismissal. The statute does not, for those offenses, impose a mandatory minimum term of confinement. Confinement, reduction in grade, and forfeitures remain within the sentencing authority’s discretion up to the maximum the President has set for the offense. So a court-martial that convicts on a sexual assault charge under Article 120(b) must adjudge at least a dishonorable discharge, but it is not statutorily required to impose any particular number of years of confinement.
Rape under Article 120(a) carries a far more severe maximum, including the possibility of confinement for life with eligibility for parole, along with a dishonorable discharge and total forfeitures. The mandatory floor for rape, as with sexual assault, is the punitive discharge required by Article 56(b); the maximum punishment is what distinguishes the gravity of rape from other Article 120 offenses.
Limits on disapproving the mandatory minimum
Article 56(b) is reinforced by a restriction on after-the-fact clemency. When a mandatory minimum applies under Article 56(b) to an offense of conviction, the convening authority, or another official authorized to act on the sentence, may not disapprove, commute, or suspend the mandatory minimum portion in whole or in part, except in the limited circumstances the statute itself permits. This means the punitive discharge required by the statute generally cannot be removed through ordinary post-trial action. The mandatory minimum is intended to be durable rather than a starting point that command leadership can later erase.
The effect of the offense date
Military sentencing has changed in recent years, and the date of the offense matters. Offenses committed before December 27, 2023, are sentenced under the traditional model in which the President sets maximum punishments for each offense. Offenses committed on or after that date fall under a sentencing parameter system, in which sentencing follows statutorily authorized parameters and criteria implemented by the President. Through both regimes, however, the Article 56(b) mandatory minimum of a dishonorable discharge or dismissal for the covered Article 120 offenses has continued to apply. The framework around confinement has evolved, but the floor of a punitive separation for these offenses has remained constant.
Practical implications for an accused
For a service member charged under Article 120, the existence of a mandatory minimum has several consequences. It means that a conviction on a covered offense will end the military career with a punitive discharge regardless of mitigating circumstances, with the loss of benefits and the lasting stigma that a dishonorable discharge or dismissal carries. It also shapes the strategic value of contesting the charge versus negotiating, because a guilty finding on the listed offense removes the option of a sentence that preserves an honorable or general discharge.
These stakes are part of why Article 120 cases are litigated so intensely. The mandatory minimum cannot be bargained away after a conviction on a covered offense in the ordinary course, so the most consequential decisions often happen earlier, in how charges are framed and whether the government can prove the specific subsection that triggers the Article 56(b) floor. A charge that resolves to a different, non-listed offense may avoid the mandatory minimum entirely, which is why the precise offense of conviction, not merely the Article 120 label, determines whether the mandatory punitive discharge attaches.
In summary, yes: rape and sexual assault under Article 120, along with the child offenses under Article 120b and certain attempts and conspiracies, are subject to a statutory mandatory minimum of a dishonorable discharge or dismissal under Article 56(b). That minimum is a guaranteed punitive separation rather than a fixed term of confinement, and it generally cannot be disapproved or suspended after conviction.
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.