0331 Machine Gun Practice Test

The concept being tested is how fire is categorized by the path its bullets take relative to the ground. Grazing fire and plunging fire describe how the trajectory interacts with the terrain—grazing fire travels almost parallel to the ground at a constant, low height, while plunging fire comes down from above at a steep angle, often at shorter ranges. Direct fire, by contrast, is defined by fire delivered along the target’s line of sight—it's about visibility and aiming, not about how the trajectory sits relative to the ground. Because of that, it doesn’t belong to the two ground-related classes of fire. Indirect fire is also a different concept (fire delivered without a direct line of sight), but the question’s key identifies direct fire as the one that isn’t one of those ground-based classifications.