What is the main reason for not entering a high-hazard impact area without permission?

The primary reason for not entering a high-hazard impact area without permission is to prevent unauthorized personnel injury. High-hazard impact areas are specifically designated zones where there is a significant risk of hazards due to activities such as live-fire exercises, explosive testing, and other military operations that could cause physical harm. Therefore, access is restricted to ensure the safety of everyone involved. Unauthorized entry can lead to serious injuries or fatalities, making it crucial to enforce strict access controls and adhere to safety protocols.

While the other options address valid concerns related to military operations, they do not emphasize the immediate and critical priority of protecting human life. Ensuring that only authorized and trained personnel enter these areas directly correlates with preventing injuries, which is the overriding objective in maintaining safety in potentially dangerous environments.