What is the main function of the Post flag?

The main function of the Post flag is that it is flown at military installations. This flag serves as a symbol of the installation's presence and is typically displayed throughout the day, signifying the installation's identity and the authority of the command structure at that location. The Post flag reflects the military's adherence to tradition and protocol, promoting a sense of pride and duty among personnel stationed there.

While flags are indeed used during ceremonies, the specific role of the Post flag is to represent the installation itself, thus distinguishing it from ceremonial flags used in specific events or occasions. Additionally, it is not exclusive to retreats, as it is displayed continuously at the installation barracks and command centers. Lastly, while flags are flown on ships, the Post flag is specifically designated for use at military installations on land.