What is the purpose of the Observer sending a correction for HOB during an illumination mission?

The purpose of the Observer sending a correction for Height of Burst (HOB) during an illumination mission is to adjust the explosion height. This adjustment is crucial because HOB determines the altitude at which the illumination round will detonate, ensuring that the light produced adequately illuminates the intended target area. An effective HOB can enhance the visibility for operations, allowing for better observation and engagement of targets in low-light conditions. Adjusting the HOB is essential for achieving the desired illumination effect, thereby supporting the mission's objectives while ensuring safety and effectiveness in operations.