2-120. Paragraphs 2-121 through 2-151 highlight several of those tasks. (See ADRP 6-0 for a complete discussion of the mission command warfighting function.) Commanders need support to exercise mission command effectively. At every echelon of command, each commander establishes a mission command system—the arrangement of personnel, networks, information systems, processes and procedures, and facilities and equipment that enable commanders to conduct operations (ADP 6-0). Commanders organize the five components of their mission command system to support decision making and facilitate communication. The most important of these components is personnel.