What type of space is defined as up to 1.8m above the deck when firing over terrain?

The correct concept in this context is danger space. Danger space refers to the area in which a projectile can be effectively delivered to a target while considering the trajectory of the round as it travels toward the target. Specifically, it is the vertical space that encompasses the first 1.8 meters above the ground when firing over uneven terrain, such as hills or obstacles.

In machine gun employment, understanding danger space is critical because it helps to identify where a target would be vulnerable to fire. When engaging targets at varying elevations or over terrain, the characteristics of the fire can change significantly, and knowing where danger space exists allows for more effective targeting and engagement. This principle ensures that the maximum effective range and coverage of machine gun fire are utilized to suppress or destroy enemy forces.

The other terms mention aspects of fire and engagement, but they do not directly cover the specific definition related to vertical space above the terrain when firing. Dead space refers to areas that cannot be effectively engaged due to obstacles and terrain features, plunging fire is associated with downward angles of fire often overlooking terrain, and grazing fire is a type of fire used when the trajectory remains low and close to the ground, avoiding the effects of elevation. Understanding these terms and their application helps in the proper execution of