What command is given to form a platoon at normal interval?

The command given to form a platoon at normal interval is "Fall In." This command instructs the personnel to assemble in their designated formations, allowing for spacing that is appropriate for normal intervals between individuals. It effectively emphasizes the importance of structure and discipline in military formations, ensuring that each member is properly aligned and prepared for further commands or actions.

The term "normal interval" specifically refers to the recommended space between individuals, allowing for ease of movement and communication within the formation. This command is foundational in establishing order and cohesiveness, crucial aspects of military operations.

The other options do not specifically refer to this action. "Fall Back" involves a retreat or movement away from the enemy, "Attention" is a command to stand at a position of readiness without movement, and "Form Up" can imply a more general gathering without specifying the spacing required for normal intervals. Thus, "Fall In" is the precise command needed for forming a platoon correctly and effectively at normal intervals.