Which of the following is NOT a class of fire with respect to the ground?

The classification of fire in a military context often refers to how fire is directed relative to the ground and the target. Grazing fire, plunging fire, and dead space all denote specific types of firing patterns that can affect the effectiveness of weaponry on the battlefield.

Grazing fire refers to fire where the trajectory of the bullet remains close to the ground, making it effective against enemy troops or vehicles close to the firer's position. Plunging fire, on the other hand, describes fire where the bullets come down from a height at a steep angle, usually effective against targets situated in lower terrain or behind cover, maximizing the impact of the weapon's range. Dead space refers to areas on the ground where direct fire is ineffective because specific terrain features (like dips or depressions) prevent the weapon from reaching the target.

Oblique fire, however, does not constitute a standard class of fire with respect to the ground as defined in traditional military terminology. It generally describes a firing angle that is neither perpendicular nor parallel to the ground but may not hold the same tactical significance or established categorization as the other types. Thus, identifying oblique fire as not falling within the defined classes of fire highlights its lack of conventional use in military doctrines concerning ground operations