What does General Order 11 specifically highlight about night duty?

The correct choice emphasizes the importance of heightened vigilance during night duty. General Order 11 underscores that individuals assigned to night watch must be especially watchful. This heightened awareness is crucial because nighttime conditions can obscure visibility, making it easier for potential threats to approach unnoticed. A soldier's alertness plays a vital role in maintaining security and safety during periods of reduced visibility.

While maintaining silence is an important aspect of various military duties, particularly for stealth, the primary focus of General Order 11 is on the necessity of being watchful. Taking breaks frequently is more related to managing fatigue, which, while important, does not directly address the specific focus of the order. It is also essential to understand that challenging only officers does not align with the broader responsibilities assigned during night duty, which involves being observant of all personnel and any unauthorized movements in the vicinity. Therefore, vigilance during nighttime operations is critical for effective duty performance and overall mission success.