Which term refers to the firing method when the cone of fire does not rise more than one meter off the ground?

The term that refers to the firing method when the cone of fire does not rise more than one meter off the ground is grazing fire. This firing technique is designed to keep the projectiles directed close to the surface, thereby maintaining a low trajectory. Grazing fire is particularly effective in targeting enemies who are positioned at ground level, as it minimizes the risk of projectiles traveling too high and missing targets. This method is essential in providing suppressive fire while exposing minimal risk to friendly forces.

In contrast, the other terms pertain to different firing techniques or positions. Frontal fire typically involves shooting towards an enemy head-on, which can result in a varied trajectory and elevation of fire. Oblique fire refers to shooting at a target that is at an angle, which can also cause the cone of fire to rise above one meter depending on the situation. Lastly, capital fire does not pertain to a recognized firing technique in the context of machine gun operations, making grazing fire the correct answer.