At what meter bracket can the observer request FFE when the PER is 38 meters or larger?

The correct answer is based on the understanding of adjusted firing ranges and the guidelines for calling for a Fire for Effect (FFE). When the Preliminary Error Range (PER) is 38 meters or larger, it is indicated that the observer can safely ensure the accuracy of their fire requests. This margin allows for effective engagement of targets while minimizing the risk of collateral damage or ineffective fire.

In practice, the standard bracketing for FFE requests when the PER is at this level generally starts at a range of 100 meters. This ensures that the engagement area is wide enough to account for potential deviations and ensures that the effects can be maximized on the designated target without risking unintended impacts nearby.

The other choices offer smaller distances, which would not accommodate the necessary space for safe firing under the conditions specified with a PER of 38 meters or larger. Hence, requesting FFE at 100 meters represents a prudent tactical decision, maximizing safety and effectiveness in artillery operations.