What type of command is primarily used to direct support fires?

The primary method for directing support fires is through oral fire commands. This approach is essential because it allows for real-time communication between the fire direction center and the firing units. Oral fire commands enable commanders to convey crucial information quickly, such as target locations, adjustments, and coordination of rounds, which is vital in dynamic combat situations where conditions can change rapidly.

While written fire plans provide a structured approach and are important for planning purposes, they are not as effective in fast-paced scenarios where immediate action is required. Visual signals can be helpful in certain contexts, such as directing movements of troops, but they lack the specificity and immediacy needed for precision fire direction. Signal flags are primarily used for communication over distances, but they are not a standard method for directing fires in modern infantry tactics, making oral commands the most practical and efficient choice in this context.