Which of the following should cadets avoid during training?

Using a cell phone without permission during training is something that cadets should indeed avoid. This behavior can be distracting not only for the individual but also for their peers, potentially hindering the learning experience. Training environments require a certain level of focus, and the use of cell phones can disrupt attention, prevent engagement with the material being presented, and create a lack of respect toward instructors and fellow cadets. Proper etiquette in training settings emphasizes the importance of being present, attentive, and fully engaged, which includes refraining from distractions such as personal devices unless permitted for specific purposes.

The other options represent positive behaviors that cadets should strive to demonstrate – arriving on time, listening attentively, and participating in discussions all contribute to a productive and respectful training atmosphere.