To achieve Double Arms Interval from normal interval in a line formation, which command is given?

To achieve Double Arms Interval from a normal interval in a line formation, the command given is "Take Interval to the Left, March." This command instructs Marines to adjust their spacing in such a way that they move laterally to the left, thereby increasing the distance between individuals in the formation to the designated Double Arms Interval.

When executing this command, each Marine takes a step to the left, effectively doubling the distance that exists in a standard line formation. This adjustment is crucial in certain tactical situations where additional space is needed for movement, visibility, or coordination between individuals.

In contrast, the other commands either direct movement in a different direction, refer to actions that don't specifically create Double Arms Interval, or use phrasing that is not aligned with the established terminology for modifying intervals in line formations. For instance, "Take Interval to the Right" would not achieve the intended spacing, and "Step Back, Take Interval" implies a linear increase instead of lateral adjustment. "Spread Out, March" is more ambiguous and does not clearly denote the action required to achieve the precise adjustment of Double Arms Interval.