2-84. At each echelon, a commander or leader task-organizes available capabilities to accomplish the mission. The purpose of task organization is to maximize different subordinate abilities to generate a combined arms effect consistent with the concept of operations. Commanders and staffs work to ensure the distribution of capabilities to the appropriate components of the force to weight the decisive operation and main effort. Command and support relationships describe the relationships between units within and supporting an echelon. (See ADP 5-0 for a discussion of these relationships.)