Which procedural aspect is NOT involved in NJP?

A key aspect of Non-Judicial Punishment (NJP) is that it is designed to be an administrative process rather than a legal trial. This means there is no extensive trial process where evidence is presented in a public setting. In NJP, the focus is on maintaining good order and discipline within the unit, allowing commanders to address minor offenses in a relatively quick and straightforward manner.

The other procedural aspects of NJP, such as gathering testimonies from witnesses, offering the accused a chance to speak, and recording the proceedings for later reference, are all integral to the process. These procedures ensure that the process is fair and allows for the accused's voice to be heard, while also providing a basis for administrative decisions. Therefore, conducting a public trial does not align with the informal and expedient nature of NJP, making it the correct choice in this context.