What phase of planning involves shared authority between the CATF and the CLF?

The phase of planning that involves shared authority between the CATF (Commander Amphibious Task Force) and the CLF (Commander Landing Force) is indeed the planning phase. In this stage, both commanders work collaboratively to ensure that their operational plans align and integrate effectively. They must jointly establish objectives, identify resources, and develop a comprehensive strategy that incorporates both amphibious and ground operations. By sharing authority at this stage, they can ensure that all aspects of the mission are well-coordinated, which is critical for a successful execution of operations.

In contrast, during the embarkation phase, decisions tend to be more logistical and focused on the transportation of troops and equipment. The movement phase primarily involves the execution of transit to the operational area, while the action phase is where plans are executed but does not involve the level of strategic collaboration seen in the planning phase. Thus, the planning phase is crucial for ensuring that both the CATF and CLF have a unified and effective approach to the mission at hand.