What is the minimum distance the FO/SL must be from the guns in Direct Alignment and Direct Lay?

The minimum distance that the Fire Observer (FO) or Section Leader (SL) must maintain from the guns during direct alignment and direct lay is established to ensure safety and the effective operation of the mortars. A distance of 100 meters is necessary to provide a safe separation from the danger zones that can be associated with the firing of artillery, including the potential for blast overpressure, debris, and recoil effects.

This distance is part of standard safety procedures that aim to protect personnel while still allowing for effective coordination and control of fire missions. The choice of 100 meters strikes a balance between safety and operational effectiveness, allowing the FO/SL to maintain sufficient situational awareness and command over the firing operations.

In the context of the other options, distances like 50 meters may not provide adequate safety due to the potential hazards of artillery fire, while distances of 200 meters and 300 meters would be unnecessarily far for effective communication and control during direct lay and alignment tasks.