What situation warrants the use of reconnaissance pull techniques?

The use of reconnaissance pull techniques is particularly appropriate in situations where commanders lack certainty about the enemy's makeup and are constrained by time. In a scenario where the enemy's positions and strengths are not clearly defined, pulling for reconnaissance data allows for gathering timely intelligence that can directly inform actions and strategies. This approach enables commanders to focus on the most relevant information and adapt their plans accordingly, ensuring that they are responding effectively to an evolving battlefield situation.

By prioritizing the gathering of information on enemy composition under time pressure, commanders can make informed decisions that enhance their operational effectiveness. In contrast, the other situations described in the other choices suggest conditions where reconnaissance might not be as urgent or necessary, such as when terrain information is clear or when there is certainty regarding enemy positions.