What is the size and use of the post flag?

The correct answer indicates that the post flag measures 10 feet by 19 feet, which is standard for general display purposes. This size is commonly used at military installations and other official sites, providing a visible representation of the flag that is appropriately scaled for outdoor display. The dimensions are designed to ensure that the flag is proportionate to typical flagpoles used in those environments, allowing for clear visibility while also conforming to military tradition and regulations regarding flag usage.

The 10 by 19-foot size strikes a balance between being large enough to honor the flag's significance and small enough to be manageable for regular flag handling and maintenance. It is typically used on days when the flag is displayed in good weather, showcasing the flag's importance in a way that respects its symbolic nature. This standard also allows for uniformity across military posts, enhancing the visual cohesiveness of the flag display at various locations.

In contrast, the other options describe sizes or uses that do not align with established flag protocols for military settings, which is why they are not the correct choice.