Which of the following is NOT a reason for MARK to be included in the method of engagement?

The inclusion of MARK in the method of engagement serves various purposes essential for effective fire support coordination. Understanding why the correct answer is C involves recognizing the distinct roles that marking plays in military operations.

When it comes to orienting oneself in a zone of observation, marking helps troops or observers familiarize themselves with their surroundings and identify target locations accurately. This is crucial for situational awareness and effective target engagement. Similarly, marking is significant for pointing out targets to other forces on the ground or in the air, ensuring clear communication about the location of threats or objectives.

In contrast, marking for the illumination optimal height of burst typically falls under specific artillery or munitions considerations that are more about tactical mission planning rather than the immediate engagement method itself. The method of engagement primarily focuses on how forces interact with targets and communicate regarding them; hence, this aspect of marking does not fit as a primary reason for its inclusion.

Thus, answer choice C accurately reflects an element that is not aligned with the primary functions of MARK in the context of the method of engagement.