What does a Restrictive Fire Line prohibit?

A Restrictive Fire Line (RFL) prohibits the crossing of friendly force boundaries by indirect fire. This includes any sort of artillery or mortar fire that would impact areas where friendly units are present, thereby reducing the risk of friendly fire incidents and preserving the integrity of the friendly units on the battlefield.

By implementing a Restrictive Fire Line, commanders aim to maintain control over the fire support coordination and ensure that the weapons are employed effectively without causing unintended casualties. It allows for safe maneuvering of troops while still enabling them to engage the enemy without the increased risk that comes with overlapping friendly locations.

The other options pertain to different considerations on the battlefield, but they do not accurately describe the defining characteristics and intent of a Restrictive Fire Line as it specifically relates to friendly fire incidents.