The accessory after the fact offense in the military justice system lives in Article 78 of the Uniform Code of Military Justice. Whether a service member can be charged under Article 78 in connection with a war crime depends on how the underlying conduct is classified and which forum has jurisdiction. The short answer is that Article 78 reaches conduct in which a member helps an offender escape justice for an offense punishable under the Code, and a war crime committed by a service member can frequently be charged as such an offense. This article walks through the elements, the jurisdictional questions, and the limits.
What Article 78 punishes
Article 78 does not punish the original crime. It punishes someone who helps the offender after the crime is complete. To convict under Article 78, the prosecution must prove four elements. First, that an offense punishable by the Code was committed by a certain person. Second, that the accused knew that this person had committed the offense. Third, that the accused thereafter received, comforted, or assisted the offender. Fourth, that the accused did so for the purpose of hindering or preventing the apprehension, trial, or punishment of the offender.
Several features of these elements matter for the war crime context. The principal offender does not need to have been convicted, or even charged, for an accessory to be prosecuted. The accused must have had actual knowledge that a specific offense was committed; mere suspicion, rumor, or a vague sense that something happened is not enough. And the accused must act with the purpose of shielding the offender from justice. Simply failing to report an offense does not, by itself, make a person an accessory after the fact under Article 78.
How a war crime fits the “offense punishable by the Code” element
Article 78 requires that the underlying offense be one punishable by the Uniform Code of Military Justice. Conduct that the public would describe as a war crime, such as the killing of a detainee, the abuse of prisoners, or the deliberate targeting of protected persons, ordinarily violates one or more punitive articles of the Code when committed by a service member. The same conduct can constitute murder under Article 118, various forms of assault, maltreatment of a subordinate, or other enumerated offenses. Because service members remain subject to the Code at all times and in all places, including during …