What dictates the primary mission of a machinegun during a Final Protective Line (FPL)?

The primary mission of a machinegun during a Final Protective Line (FPL) is focused on stopping an enemy assault with grazing fires. The FPL is a designated line of defense established to provide a final stand against enemy forces. In this context, the machinegun's role is to deliver effective fire across an area that is likely to be approached by enemy troops.

Grazing fire is characterized by the bullets traveling parallel to the ground and striking the enemy forces at a low angle. This type of fire is most effective in inflicting casualties and hindering the enemy's movement toward friendly positions, which is crucial during a decisive moment in combat. The use of machineguns in this manner maximizes the weapon's lethality and helps to create a robust defensive posture, ensuring that the enemy cannot successfully assault through that line.

Other possible missions for a machinegun, such as providing covering fire for advancing troops or monitoring enemy supply routes, are important but do not specifically align with the primary objective during the engagement of an FPL. The focus during an FPL is directly on creating a barrier to halt the enemy’s advance, emphasizing the importance of the machinegun’s capability to deliver substantial and effective fire against an attacking force.