What is your first command when your division gathers for morning quarters?

The correct response is "Fall In" because this command is specifically used to instruct personnel to take their positions in formation. During morning quarters, it is essential for all members of the division to assemble in an orderly manner, and "Fall In" effectively conveys the need for all individuals to line up with their peers.

This command sets the stage for the ensuing activities that are part of morning quarters, such as inspections, briefings, or updates. It ensures that all service members are present and ready for the day's agenda in a structured manner.

While "Stand By" might imply readiness for further instructions, it does not prompt immediate action to physically come together as a group. "Attention" would command the division to stand in a position of alertness but does not facilitate the formation gathering itself. "Assemble" could suggest the idea of gathering but is typically less formal than "Fall In," which is the clearly delineated command for taking formation in military settings.