This appendix provides basic guidance for commanders and staff officers on the organization of forces, control measures, and planning, preparing, and executing considerations pertaining to rear area and base security and route and convoy security operations. The tactics and techniques expressed in this appendix are applicable across the full spectrum of operations (offense, defense, stability, and support). However, commanders must interpret them in accordance with the enemy's capabilities. For example, the physical layout of a base will be vastly different if the enemy has a significant air capability than if the enemy has no air capability. The purpose of rear area and base security operations is to prevent interruption of current and future operations. Rear area and base security operations constitute one of the five elements that constitute sustaining operations.