When the command "open ranks" is given, what action should the members of the third rank take?

When the command "open ranks" is given, members of the third rank are instructed to stand fast. This means they remain in their current position rather than moving forward or to the side. The purpose of this command is to create space between the ranks of a formation. The first and second ranks will move forward to widen the formation, while the third rank, being in the rear, does not advance. This action allows for better visibility and alignment of the formation while ensuring that every rank maintains its appropriate position and spacing. This understanding of formations and movements is critical for maintaining discipline and structure during drills and parades.