What item is explicitly authorized to wear as a wrist accessory?

The correct choice, which includes both a wristwatch and an identification wristband, is explicitly authorized as a wrist accessory. This reflects military regulations that focus on maintaining uniformity and professionalism in attire.

A wristwatch is considered an appropriate accessory as it is practical for time management and task execution, which are essential in military operations. The identification wristband serves a critical purpose in ensuring personnel can be easily identified, especially in various settings, such as medical situations or deployments.

The other options do not align with the specific guidelines provided by military regulations. For instance, the mention of a "bracelet of choice" or "any wristband" introduces ambiguity and could imply accessories that do not have any functional or identification-related purpose. This could detract from the uniform appearance expected of personnel and compromise the overall professional standards set forth by military protocols.