What is the primary focus of the Primary Defensive Fire (PDF) in machine gun operations?

The primary focus of Primary Defensive Fire (PDF) in machine gun operations is to cover likely avenues of approach (AOA). This tactic is essential in a defensive strategy, as it ensures that enemy forces cannot advance efficiently on a position. By concentrating fire on known and anticipated routes that the enemy may use to approach, the machine gun unit can effectively disrupt enemy movement and force them to adopt a more cautious approach, thereby increasing the effectiveness of defensive operations.

In a defensive role, the machine gun provides a critical layer of protection by creating a sustained and concentrated volume of fire on these avenues. This not only hinders the enemy's ability to maneuver but can also cause confusion and disarray among their ranks, which enhances the defensive position's overall effectiveness. Prioritizing these avenues allows for a better allocation of fire and resources, ensuring that the most likely points of contention are adequately defended, thereby upholding the integrity of the defensive structure.