7-176. Once a commander determines the scheme of maneuver, the commander task-organizes the force to give each unit enough combat power to accomplish its mission. Commanders normally organize the attacking force into a security force, a main body, and a reserve, all supported by some type of sustainment organization. Commanders should complete any changes in task-organization in time to allow units to conduct rehearsals with their attached and supporting elements. The best place and time for an attacking force to task-organize is when it is in an assembly area.