What should a sentry do if they observe a violation of orders?

A sentry who observes a violation of orders is primarily tasked with maintaining the security and adherence to regulations within their assigned area. Reporting all violations of orders is crucial because this action ensures that the chain of command is aware of any breaches, allowing them to address and rectify the situation appropriately. This responsibility upholds the integrity of the mission and the safety of personnel and equipment.

Other choices provide important aspects of a sentry's duties but do not directly address the immediate action required when a violation occurs. Walking the post in a military manner is vital for maintaining discipline and presence, while not quitting one's post without proper relief ensures that security is maintained; however, these do not directly resolve the issue of an observed violation. Similarly, taking charge of government property is related to the custody and care of equipment but does not pertain to violations of orders. Reporting violations is the most critical and immediate action a sentry should take in such situations.