Not every failure to do a job well is a crime. Military law draws a careful line between conduct that can be punished as dereliction of duty and conduct that reflects a genuine inability to perform despite honest effort. The distinction between neglect and incompetence is at the heart of that line. Under Article 92 of the Uniform Code of Military Justice (UCMJ), the difference often decides whether a poor performance is a chargeable offense or merely a matter for training, reassignment, or administrative handling. Understanding how the military separates the two requires looking at the mental-state categories the law uses and at the recognized defense of ineptitude.
Dereliction of duty under Article 92
Article 92 of the UCMJ includes dereliction of duty as one of its offenses, alongside failure to obey a lawful general order or regulation and failure to obey other lawful orders. Dereliction is the performance-based theory. It applies when a member who has a duty fails to perform it, but the failure must be accompanied by a culpable mental state. The military does not punish dereliction on the basis of a bad result alone. The fact-finder must connect the failure to one of the recognized forms of culpability.
The recognized forms of culpable dereliction
Dereliction can occur in several ways, and each carries a different mental state:
Willful dereliction means intentionally failing to perform a known duty. The member knows what is required and purposely does not do it. This is the most serious form and carries the harshest exposure, because it involves a conscious choice rather than a lapse.
Negligent dereliction occurs when a member fails to exercise the degree of care that a reasonably prudent person would have used in the same circumstances. The member had a duty to use due care and fell short of the expected standard. There is no intent to fail, but there is a failure to meet the objective standard of reasonable care.
Culpable inefficiency, sometimes described in terms of culpable negligence, covers a member who had the ability and training to perform a task but executed it so poorly that the result was unacceptable by any reasonable measure. The key here is that the member possessed the capability and resources to succeed but did not apply them.
These three categories are what the law means when it speaks of “neglect” in the performance context. Each requires more than …