When must the firer or VC announce a sensing?

The correct choice emphasizes the procedural importance of communication during the engagement process. Announcing a sensing before any supplemental fire command ensures that all team members are aware of the results of the initial fire command and can adjust their actions accordingly. This communication is crucial for maintaining situational awareness and enabling effective coordination among units, especially in complex environments where multiple actions may be occurring simultaneously. By doing so, it allows for accurate assessments and adjustments to be made, should the initial engagement not have the desired effect on the target.

This timing helps in avoiding confusion and ensures that fire can be directed accurately without delay, enhancing the effectiveness of subsequent commands. In the context of direct fire scenarios, clear and timely communication about the current status of the engagement can dramatically influence the overall success of the operation.