4-24. Army headquarters provide the command structure to plan, prepare, execute, and assess operations with the joint force and partner nations. Army forces support partners with situational understanding, area security, and sustainment. Army forces ensure combatant commanders possess the ability to scale-up and sustain land forces rapidly through force projection, forward positioning, placement and maturity of theater infrastructure capabilities, and the use of Army pre-positioned equipment and supplies. Army headquarters help impose order in chaotic situations and synchronize plans, programs, and efforts necessary to accomplish the mission.