8-76. The transfer of an AO to a legitimate authority relieves the land force of area security and stability tasks and represents a transition from operations to consolidate gains to operations to shape or prevent. As the theater army headquarters coordinates the movement of most Army forces out of theater, it resumes the tasks necessary to sustain the gains consolidated during large-scale combat operations. Conditions on the ground and resources available determine what security and cooperation tasks have priority. It is possible that Army forces occupy long-term garrisons to prevent a recurrence of hostilities, as happened in Europe, Japan, and Korea in the 20th century. Alternatively, there may be a more robust security cooperation arrangement involving training of forces. Regardless of the tasks required in a specific AO, Army units will continue to perform the missions that reflect their strategic roles of shape, prevent, win, and consolidate gains in support of U.S. interests.