What consideration is NOT associated with general unloading?

The correct answer is based on the understanding that general unloading in an amphibious operation relies on strategic considerations that ensure the success and flow of operations. The first three options—favorable attack progress, established support areas, and adequate security—are all crucial for facilitating an effective unloading process.

When unloading supplies and equipment during amphibious operations, it is vital that the progress of the attack is favorable to maintain momentum and secure footholds. Established beach support areas are essential for organizing and staging personnel and materials, ensuring that logistics can support the ongoing tactical mission. Adequate security for supply installations is necessary to protect these resources from enemy actions, which can compromise the operation.

In contrast, the assertion that all supply locations are unsecured does not align with standard operational procedures. Effective planning involves securing supply locations to prevent them from becoming vulnerable to enemy attacks or disruptions, making this statement inaccurate in the context of general unloading considerations. Thus, it stands out as the option that does not fit with the critical elements necessary for successful amphibious unloading operations.