Final answer:
Some Surface Danger Zones (SDZs) may not be required when firing inert practice projectiles at soft targets, due to the lower risk posed by non-explosive projectiles, with exact requirements varying by military regulations and practices.
Step-by-step explanation:
When firing inert practice projectiles at soft targets, certain Surface Danger Zones (SDZs) may not be required. SDZs are used in military fire training exercises to ensure the safety of personnel and equipment by accounting for the possible distance that projectiles, fragments, and debris could travel. For inert practice projectiles specifically, the requirement for some SDZ areas might be lessened or waived, as the projectiles are non-explosive and pose a lower risk. This is often determined by the range control authorities based on factors such as the type of projectile, target composition, and environmental considerations. The exact requirements can vary depending on military regulations and the practices of the particular military installation or training area.