To coordinate the movement of units to the PZ, the PZCO: Selects troop assembly areas, holding areas and routes of movement. Selects a holding area located close to the PZ; it is used only when the assembly area is some distance away and does not allow timely movement to the PZ. Determines movement time of ground units to the PZ. Specifies arrival time(s) and sees that movement of units remains on schedule.