What does General Order 10 dictate about colors and standards?

The correct answer underscores the protocol regarding colors and standards within military conduct. General Order 10 clearly states that all colors and standards not cased are to be saluted. This guideline emphasizes the respect and honor associated with military flags and banners, which represent the service, its history, and its values. Saluting colors and standards not only acts as a sign of respect but also strengthens the unity and discipline within the military ranks.

The other options, while related to military protocol, do not accurately reflect the core directive of General Order 10. For instance, casing colors pertains to a specific handling procedure during certain situations, such as ending a ceremonial display, rather than a general requirement. Similarly, while all officers on duty must salute during various occasions, this is not the focus of General Order 10. Finally, while sentries are expected to understand the significance of colors and standards, the specific requirement in General Order 10 is centered on the act of saluting them when they are displayed.