Under what conditions are 1MC/3MC announcements NOT authorized?

The correct choice indicates that 1MC/3MC announcements are not authorized between taps and reveille due to the specific protocols surrounding these times. Taps marks the end of the day and is associated with the quiet closure of activities, while reveille signals the awakening of personnel and the start of a new day. By not allowing announcements during this timeframe, it preserves the solemnity and respect associated with these ceremonial moments.

This restriction helps maintain order and discipline within the command, ensuring that service members observe the appropriate customs and traditions. Other options do not impose such limitations, as drills, being in port, and official visits often necessitate communication for operational effectiveness and the proper conduct of activities. Nonetheless, during the hours around taps and reveille, silence is generally observed to honor the time-honored traditions of military life.