What additional line of the CAS 9-line is a mandatory readback when working with NATO forces?

When operating with NATO forces, Line 8 of the CAS 9-line brief is a mandatory readback. This line specifies the danger close range, which is critical for ensuring the safety of friendly forces while coordinating close air support. The emphasis on a mandatory readback for Line 8 is designed to minimize the risk of fratricide and ensures that all parties are aligned on the accepted safety limits regarding the proximity of friendly troops to the target area.

Understanding the importance of this line helps maintain effective communication and situational awareness among units involved in joint operations, which is essential in complex combat environments. Ensuring that Line 8 is clearly communicated and confirmed allows for a more precise execution of air support missions while prioritizing the safety of ground troops.