What is the appropriate first step when breaking up a shoving match between cadets?

The appropriate first step when breaking up a shoving match between cadets is to physically separate the cadets. This action addresses the immediate need to ensure the safety of all individuals involved as well as bystanders. Taking direct action to separate those in conflict can prevent the situation from escalating further and allows for a more controlled environment in which to address the underlying issues.

By intervening physically, one can immediately halt the aggression and diffuse the tension between the cadets. This proactive approach is crucial because waiting to intervene or relying solely on verbal commands in a heated situation may not be effective, and could potentially lead to more severe conflicts. Other options, while potentially useful later, do not address the immediate safety concern posed by the physical altercation.