Which general order requires a person to quit their post only when properly relieved?

The general order that requires a person to quit their post only when properly relieved is indeed the fifth general order. This order emphasizes the importance of maintaining responsibility and accountability for the duties assigned to a watchstander. It ensures that security and operational effectiveness are not compromised by allowing personnel to leave their posts without having someone to take over their responsibilities.

In a military or security context, this order is crucial as it helps prevent lapses in vigilance and ensures that there is always someone in position to fulfill the required watch duties. Proper relief means that a designated replacement has come to take over the position, thereby allowing the person on duty to leave without leaving the post unattended. This principle is fundamental to maintaining order and security in various operational environments, reinforcing the necessity of communication and coordination among service members.