What does the Sixth General Order of a Sentry require a sentry to do?

The Sixth General Order of a Sentry specifically requires a sentry to quit their post only when instructed. This order emphasizes the importance of maintaining station and presence until received orders designate otherwise. This unity and reliability are crucial as it ensures proper security protocols are upheld, which is fundamental in maintaining the chain of command and the safety of the area being protected. It serves to reinforce discipline and adherence to duty without unauthorized departures from the post, vital characteristics in military operations.

In relation to the other options, they pertain to different responsibilities of a sentry but do not specifically represent the essence of the Sixth General Order. For example, passing on orders or walking the post and remaining alert are critical, yet they belong to other General Orders focused on communication and vigilance, respectively. Maintaining the integrity of one's post until properly relieved is the crux of the Sixth General Order, ensuring that the strategic and operational frameworks remain intact.