Article 87 of the Uniform Code of Military Justice, codified at 10 U.S.C. 887, makes it an offense to miss the movement of a ship, aircraft, or unit with which a service member is required in the course of duty to move. Because the offense turns on the failure to move with one of those three things, the meaning of movement is the central interpretive question. Not every change of location triggers the statute. Understanding what counts, and what does not, is essential for both prosecution and defense.
The statutory text and the three vehicles of movement
The statute reaches a person who, through neglect or design, misses the movement of a ship, aircraft, or unit. Following changes that took effect under the recodification, Article 87 also addresses jumping from a vessel into the water, but the missing-movement portion remains tied to those three categories. The accused must have been required, in the course of duty, to move with the ship, aircraft, or unit; must have known of the prospective movement; and must have missed it through design or neglect. The vehicle of movement is therefore not incidental. A failure to appear that is not connected to a ship, aircraft, or unit movement falls outside Article 87, even if it amounts to some other offense such as unauthorized absence.
The substantiality requirement
Military authorities have long understood that a movement under Article 87 means a move, transfer, or shift of a ship, aircraft, or unit involving a substantial distance and a substantial period of time. The statute does not set a fixed number of miles or a minimum number of hours. Instead, whether a particular relocation qualifies depends on the circumstances, judged against the purpose of the article, which is to ensure that members are present for operationally significant movements.
This substantiality element is what separates a qualifying movement from a routine or trivial relocation. Repositioning a ship from one berth to another in the same harbor generally does not qualify. Shifting a unit from one set of barracks to another on the same installation generally does not qualify. A brief practice march or a short local exercise typically does not rise to the level of a movement within the meaning of the article. These are minor shifts, not the kind of substantial transfer the statute targets.
Examples that typically qualify
By contrast, a movement that covers significant distance over a meaningful span of time generally falls within the statute. A ship deploying from its home port for an extended period, an aircraft departing on a mission or a permanent change of station flight, or a unit deploying overseas or relocating to a distant duty location are the paradigm cases. The defining features are that the movement is operationally meaningful and that the member’s presence at the point of departure mattered to the duty being performed.
Unit movement and the meaning of unit
The term unit deserves attention because it is the broadest of the three categories. A unit movement contemplates the organized relocation of a body of personnel as a unit, not the individual travel of a single member unconnected to a collective move. Where a member is ordered to travel individually, for example on temporary additional duty or to a school, the failure to depart may be charged as an absence offense rather than missing movement, because the member is not missing the movement of a ship, aircraft, or unit. The distinction matters because Article 87 is aimed at the integrity of organized operational movements.
Knowledge and the connection to duty
Although the principal question here is what qualifies as a movement, the qualifying analysis cannot be separated entirely from the surrounding elements. The accused must have been required in the course of duty to move with the particular ship, aircraft, or unit, and must have known of the prospective movement. A relocation that the member had no duty to join, or of which the member had no knowledge, does not support the charge even if it is otherwise substantial. The movement must be one the member was obligated to make.
Why the definition matters in litigation
Disputes under Article 87 frequently center on whether the relocation was substantial enough and whether it was truly a ship, aircraft, or unit movement rather than an administrative shift, a delay, or a miscommunication. A defense may argue that the relocation lacked the required distance or duration, that it was an individual travel obligation rather than a unit movement, or that what occurred was a rescheduling rather than a missed movement. The prosecution must establish that the event was a genuine movement of one of the three statutory vehicles, involving substantial distance and time, and that the member was required to be part of it.
Conclusion
Under Article 87, a movement is a substantial move, transfer, or shift of a ship, aircraft, or unit, judged by distance and duration in light of the circumstances rather than by any fixed threshold. Operationally significant departures qualify, while berth-to-berth repositioning, on-post barracks shifts, brief practice marches, and similar minor relocations generally do not. The movement must involve one of the three statutory vehicles, and the member must have been required in the course of duty to move with it and have known of it. Where the relocation is trivial, individual rather than collective, or unconnected to a duty to move, it falls outside the scope of the article.
Disclaimer
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