MIL-STD-1808B, DEPARTMENT OF DEFENSE INTERFACE STANDARD: SYSTEM SUBSYSTEM SUB-SUBSYSTEM NUMBERING (01 AUG 2007)., This standard sets forth requirements for the system, subsystem, and sub-subsystem numberingrequirements for engineering drawings, technical manuals, and other acquisition and logistics supportrequirements for aircraft, missile and space systems, engines, and ground communication-electronicequipment. Additionally, it may be used for supportability analysis, configuration management, maintenancedata collection, or wherever a consistent maintainability related reference numbering requirement existsacross a weapon system. This standard will be used by all Air Force acquiring activities and theirrespective contractors during the development and acquisition of weapon systems and equipment.