Which of the following methods may include using visual signals for communication in fire commands?

Using visual signals for communication in fire commands is effectively illustrated by marking with tracers. Tracers are rounds that leave a visible trace of light and smoke, allowing gunners and observers to see the trajectory of the rounds fired. This visual indication not only helps in aiming but also serves as a means of communication regarding adjustments in fire. When tracers are fired, they provide immediate feedback to both the shooter and the observing elements, which aids in coordination and effective engagement of targets.

While telephonic systems, written orders, and digital messaging are useful methods for communication, they lack the immediate visual feedback that tracers provide in the context of fire commands. These methods primarily rely on auditory or textual communication, which may not be as effective in quickly conveying real-time adjustments needed in a dynamic combat environment, where speed and clarity are crucial. Therefore, marking with tracers stands out as a direct and visually engaging method for coordinating and executing fire commands on the battlefield.