Which type of danger zone is designated solely for ground-to-ground training exercises?

The surface danger zone is specifically designated for ground-to-ground training exercises because it encompasses all the potential hazards associated with live-fire exercises occurring on the ground. This zone accounts for factors such as the trajectory of projectiles, the area impacted by ground explosions, and the safety of personnel participating in or nearby the exercises.

In contrast, other danger zones serve different purposes—such as air danger zones, which involve air-to-ground fire and consider the potential hazards from above; vertical danger zones, which could include hazards that affect both ground and aerial activities but are not limited to ground-to-ground training; and combined danger zones, which may include elements from various activities or training types but are not specific to just ground-based exercises. Therefore, the surface danger zone is the most fitting answer for assessing the safety and risks associated with ground-to-ground training maneuvers.