What does the 3rd General Order to the Sentry require a guard to do?

The third General Order to the Sentry focuses on the responsibility a guard has regarding the enforcement of regulations and orders. It specifically instructs the guard to report all violations of orders they are tasked to enforce. This ensures that any breaches of conduct, security, or protocol do not go unnoticed, maintaining safety and discipline within the area under the guard's watch.

This order highlights the vigilance expected of a sentry. By reporting violations, the sentry plays a crucial role in upholding the integrity of military procedures and contributing to overall unit readiness. This element of accountability is fundamental to military discipline and the effective functioning of a guard's duties.

The other choices represent important duties associated with being a sentry but do not define the focus of the third General Order specifically. For example, while talking to no one except in the line of duty is essential for maintaining professionalism, and obeying orders from commanding officers is a critical element of military conduct, these are not the primary focus of the third order. Similarly, while responding to emergencies is vital, it pertains to different procedural guidelines and does not encapsulate the essence of the third General Order.