(3) Dereliction in the performance of duties.
(a) Duty. A duty may be imposed by treaty, statute, regulation, lawful order, standard operating procedure, or custom of the service.
(b) Knowledge. Actual knowledge of duties may be proved by circumstantial evidence. Actual knowledge need not be shown if the individual reasonably should have known of the duties. This may be demonstrated by regulations, training or operating manuals, customs of the service, academic literature or testimony, testimony of persons who have held similar or superior positions, or similar evidence.
(c) Derelict. A person is derelict in the performance of duties when that person willfully or negligently fails to perform that person’s duties or when that person performs them in a culpably inefficient manner . “ Willfully” means intentionally. It refers to the doing of an act knowingly and purposely, specifically intending the natural and probable consequences of the act. “Negligently” means an act or omission of a person who is under a duty to use due care which exhibits a lack of that degree of care which a reasonably prudent person would have exercised under the same or similar circumstances. “Culpable inefficiency” is inefficiency for which there is no reasonable or just excuse.
(d) Ineptitude. A person is not derelict in the performance of duties if the failure to perform those duties is caused by ineptitude rather than by willfulness, negligence, or culpable inefficiency, and may not be charged under this article, or otherwise punished. For example, a recruit who has tried earnestly during rifle training and throughout record firing is not derelict in the performance of duties if the recruit fails to qualify with the weapon.