What is line eight of the nine line brief format to request CAS?

Line eight of the nine line brief format for requesting Close Air Support (CAS) specifically asks for the location of friendly units. This line is crucial because it ensures that the aircraft delivering the support is aware of the proximity of friendly forces to avoid any potential fratricide incidents. Providing the coordinates or description of friendly unit locations allows the pilots to maintain situational awareness and helps in validating that they are engaging only the intended targets, thereby enhancing the effectiveness and safety of the operation.

In contrast, while the other options are important elements of the CAS request process, they belong to different parts of the nine line format. For instance, the target description and target location are critical as they specify what needs to be attacked and where it is located, but they do not reflect the importance of friendly unit awareness encompassed in line eight. Requesting fire support refers to the overall request but does not pertain specifically to the friendly unit's location.