Which document is crucial for planning and executing amphibious operations?

The logistics plan is essential for planning and executing amphibious operations because it outlines the necessary resources, transportation, and support required to ensure the mission's success. This document provides critical information regarding the distribution of supplies, the coordination of personnel movements, and the establishment of necessary facilities, both on land and at sea. A well-structured logistics plan accounts for various operational variables, allowing for efficient execution of the amphibious operation.

In contrast, while other documents like the personnel assignment sheet and cargo manifest serve important roles in personnel management and cargo tracking respectively, they lack the comprehensive nature of a logistics plan. The operational order, although integral to the overall mission direction and strategy, does not delve into the details of the logistical framework that underpins successful amphibious operations. Thus, the logistics plan stands out as the crucial document ensuring all elements of the operation are effectively supported and synchronized.