What is the primary purpose of using HE during adjustments in a call for fire?

Using High Explosive (HE) rounds during adjustments in a call for fire is essential primarily for the objective of accurately correcting and refining the targeting on the intended targets. The adjustment process is crucial as it allows the forward observer to gauge the effectiveness of the fires and make precise corrections based on observed impacts.

When HE rounds are used, they provide immediate feedback on the round's trajectory, impact points, and overall effectiveness against the target. Observers can assess these elements firsthand, allowing them to communicate adjustments—either in range or direction—to ensure that subsequent rounds land closer to the desired impact point. This adjustment process not only enhances the accuracy of the strike but also maximizes the likelihood of neutralizing or destroying the target effectively.

This use of HE rounds in adjustments differentiates it from other functions like creating smoke, providing illumination, or suppressing enemy fire, which do not contribute to the precision targeting process inherent in a call for fire adjustment.