Final answer:
The order to quit a post only when properly relieved corresponds to General Order Number 5 in U.S. military conduct, which is fundamental for maintaining security and the transfer of responsibility.
Step-by-step explanation:
The order to quit a post only when properly relieved is often found within military protocol and relates to the duties and responsibilities of service members on guard or watch. This is not explicitly detailed in the executive orders or other laws provided, but it corresponds to a general understanding of military discipline and conduct. Traditionally, in the context of U.S. military orders, this is known as General Order Number 5.
It is an essential aspect of military duty, ensuring that a post is never left unattended and that the responsibility of the post is formally handed over to the next person on duty. Abiding by this order is critical for maintaining the security and effectiveness of military operations.