What command does the Flight Leader give when the assigned interior bay is clear for entry?

The command that indicates the assigned interior bay is clear for entry is one that facilitates orderly movement and positioning of personnel. In this context, the phrase "Column of files" is the correct response because it instructs members to line up in a single file, which is a common procedure for entering confined spaces or while forming a line, such as when directing individuals into a dining facility (DFAC) or a similar area.

This command helps maintain organization and ensures that personnel enter in a structured manner, reducing the potential for confusion or accidents. In controlled environments, such as military settings, maintaining an orderly flow is essential for discipline and safety, and "Column of files" achieves this goal effectively.

The other options, while relevant in certain contexts, do not specifically convey the intent to enter a space that is clear. Some commands might be used in different situations, such as general movement or formation adjustments, but they do not directly instruct personnel on how to proceed into an interior area.