Final answer:
The first person in your chain of command when standing interior guard is usually your immediate supervisor such as the Sergeant of the Guard.
Step-by-step explanation:
When standing interior guard, the first person in your chain of command is typically your direct supervisor, such as a Sergeant of the Guard or the Officer of the Day. The chain of command is a fundamental principle in military organization as it ensures orders and decisions are passed down effectively from higher authority. Understanding the immediate chain of command is crucial for operational security, following orders, and knowing who to report to in case of any incidents.