Few military offenses are as serious as leaving a post while in contact with the enemy. The Uniform Code of Military Justice (UCMJ) contains several articles that could conceivably apply to an absence from duty, and which one fits depends on the circumstances and the service member’s state of mind. The three most relevant here are Article 99 (misbehavior before the enemy), Article 85 (desertion), and Article 86 (absence without leave). Abandoning a post under enemy fire most naturally falls within Article 99, but the lines among these offenses turn on specific elements, and more than one article can be implicated by a single set of facts.
Article 99: misbehavior before the enemy
Article 99, codified at 10 U.S.C. 899, addresses a cluster of grave failures committed before or in the presence of the enemy. The statute reaches a person who, among other things, runs away; shamefully abandons, surrenders, or delivers up any command, unit, place, or military property; through disobedience, neglect, or intentional misconduct endangers the safety of a command, unit, place, or military property; casts away arms or ammunition; is guilty of cowardly conduct; quits a place of duty to plunder or pillage; causes false alarms; willfully fails to do his utmost to encounter, engage, capture, or destroy enemy forces; or fails to afford all practicable relief and assistance to friendly forces. Article 99 offenses carry the most severe penalties in the code, including the possibility of death.
The defining feature of Article 99 is the requirement that the conduct occur before or in the presence of the enemy. This element captures exactly the scenario in the question. Abandoning a post while under enemy fire is conduct in the presence of the enemy, and leaving that post can constitute running away or shamefully abandoning a place of duty. If the abandonment also endangered the unit or the position, the endangerment branch of the statute may apply as well. It is not necessary that the enemy be within sight or immediately in front of the accused; the controlling idea is that the person or the unit is engaged in or about to engage in combat. Because of this element, conduct that would be a comparatively minor absence in a garrison setting becomes a far graver offense when it happens under fire.
Article 85: desertion
Article 85 defines desertion. Its hallmark is intent. A service member commits desertion by being …