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The main function of a fire support coordination line (FSCL) is to coordinate all fire requests within an area. This line is established as part of the command and control process to manage the use of indirect fire and ensure effective and safe integration of various fire support assets within a specified operational area. By designating an FSCL, commanders can facilitate the synchronized use of artillery, mortars, and air support while minimizing the risk of friendly fire incidents.

For effective fire support, it is crucial to have clear communication and delineation of areas where certain types of fires can be called in, ensuring that all components of the operation can conduct their missions without endangering friendly forces. The FSCL enables commanders to streamline operations by clearly defining which areas can receive fire and alleviating potential conflicts between different units using fire support.

The other options do not accurately reflect the purpose of an FSCL: designating non-combat areas, allowing unrestricted fire, and establishing safe zones for troops do not represent the coordination aspect that the FSCL is specifically designed to manage in operational contexts.