Which line in the CAS brief indicates a granted authority for action?

The line in the Close Air Support (CAS) brief that indicates a granted authority for action is typically Line 1. This line outlines the type of support being requested and indicates the commander's intent for air strike authorization. It serves as a clear communication from the ground forces to the air support about the permission granted for the engagement of targets. Understanding the content and purpose of each line in a CAS brief is critical, as it ensures that pilots and ground forces are aligned on the mission objectives and the authority under which they operate. The other lines may address other aspects of the operation, such as target details and location, but Line 1 specifically conveys the permission to act, making it pivotal for the execution of the mission.