Which of the following is NOT a type of fire that characterizes a Final Protective Line (FPL)?

A Final Protective Line (FPL) is designed to provide a strong defensive position, ensuring that any enemy approach is effectively engaged. The types of fire that characterize an FPL include flanking fire, interlocking fire, and grazing fire, each serving a specific purpose in enhancing the effectiveness of the defensive effort.

Flanking fire refers to fire directed on the sides of an enemy force, allowing defenders to engage the enemy from multiple angles. Interlocking fire involves multiple weapons systems covering overlapping fields of fire, ensuring that there are no blind spots where the enemy could advance undetected. Grazing fire is a type of fire that is delivered at a low angle to the ground, which is particularly effective against personnel at short distances, as it minimizes the risk of missing targets.

Crossfire, however, while it can be an effective tactic in certain situations, is not specifically classified as a type of fire that characterizes an FPL. Instead, crossfire typically refers to a situation where two different entities engage a target from different angles, which may not align with the defined purpose of an FPL where a unified defensive line is critical. Therefore, the classification of fire types relevant to an FPL does not include crossfire, making it the correct choice for this