What is the command called when one unit of an element must execute a different movement or the same movement at a different time?

The correct response relates to the term "Supplementary Command." This command is specifically used to direct one unit of an element to execute a different movement or the same movement at a different time, allowing for coordinated actions within a larger formation. This practice is crucial in maintaining organization and precision during maneuvers, especially in military settings, where timing and coordination are essential.

In contrast, other options refer to different types of commands that do not encapsulate this particular directive. For instance, "Individual Command" refers to commands that apply to individuals rather than groups, while "Concurrent Command" refers to commands that require simultaneous actions, and "Alternate Command" usually pertains to switching roles or movements between units, which does not align with the specific requirement for executing at a different time. Thus, understanding the nuances of these commands helps solidify the basis for effective leadership and operational efficiency in the military.