4-82. If the JFC establishes a joint security area within the JOA, the ARFOR normally determines its structure and its controlling headquarters. The options for the joint security area depend on the threat and the mission variables, particularly the forces available. If the threat to the joint security area is low to moderate, the theater army commander may tailor the ARFOR with a unit specifically task-organized to control the joint security area. If the threat to theater bases, base camps, and lines of communications is unknown, the theater army may tailor the ARFOR with additional maneuver units to control that joint security area. If hostile conditions exist, the theater army may assign the mission to an Army division with BCTs and one or more maneuver enhancement brigades. (See JP 3-10 for more information.)