Which of the following is an example of an unavoidable absence for cadets?

Contagious illnesses serve as a clear example of an unavoidable absence for cadets because they pose a risk not only to the individual but also to others in the training environment. When a cadet is contagious, attending training could spread the illness, which could lead to larger health issues within the unit. Hence, such an absence is typically deemed unavoidable and is often covered by policies that aim to protect the overall health and safety of the group.

In contrast, options like family vacation, minor injuries, and short-term employment generally fall under circumstances that can be planned for or managed, leading to their classification as avoidable or manageable absences. Family vacations can be scheduled at convenient times, minor injuries may allow for attendance with modifications, and short-term employment is usually a choice made by the cadet rather than a necessity. Therefore, these other options do not carry the same weight of being unavoidable compared to the impact of a contagious illness.