According to the Third General Order of a Sentry, what is required?

The Third General Order of a Sentry emphasizes the importance of reporting violations, which is crucial for maintaining security and order within a military environment. This order requires sentries to be vigilant observers, and if they notice any deviation from established protocols or unauthorized activities, they must report these violations promptly. This ensures that any potential issues can be addressed swiftly, thereby preserving the safety and integrity of the area under their watch.

The other options focus on different responsibilities that may be part of a sentry's duties but do not specifically address the essence of the Third General Order. For example, while receiving and obeying orders is important, it pertains more to general conduct rather than the specifics of reporting violations. Furthermore, while being alert and ready to call for an officer in emergencies are vital for overall sentry duties, these actions are not explicitly encapsulated in the Third General Order itself. This order distinctly highlights the need for awareness and active reporting of any violations, a fundamental aspect of effective sentry duty.