Final answer:
Permissive fire support coordination measures expedite the attack of targets by reducing coordination necessary for the clearance of fires.
Step-by-step explanation:
Permissive fire support coordination measures can expedite the attack of targets by reducing the coordination necessary for the clearance of fires. These measures provide a greater level of freedom and flexibility for the delivery of fires, allowing supporting units to engage targets without the need for extensive approval or coordination with other units. An example of a permissive fire support coordination measure is the 'clearance of fires by the closest commander,' where the closest commander to the target area is authorized to engage targets without seeking approval from higher-ranking commanders.