1-28. Within CPs, commanders cross-functionally organize their staffs into CP cells and staff sections to assist them in the exercise of mission command. A command post cell is a grouping of personnel and equipment organized by warfighting function or by planning horizon to facilitate the exercise of mission command. Staff sections are groupings of staff members by areas of expertise under a coordinating, special, or personal staff officer. Elements are groupings of staff members subordinate to specific staff sections. Staff sections and elements of staff sections are the building blocks for CP cells. (See chapter 2 for a detailed discussion on the duties and responsibilities of staffs.)