What is the purpose of a final protective line (FPL) in combat?

The purpose of a final protective line (FPL) in combat is to provide a designated area where final protective fire can be laid down to protect friendly forces and deter enemy advances. This line is established to ensure that if the enemy reaches a certain point, effective defensive fire can be delivered to disrupt or halt their progress. The FPL acts as a last line of defense, allowing troops to maintain their position and prepare for an engagement. It is critical in ensuring that there is a coordinated response against approaching threats, making it an essential element of tactical planning in combat situations.