The ______ is an air defense zone established around an air base and limited to the engagement envelope of short-range air defense weapons systems defending that base.

• A. EIZ
• B. BDZ (base defense zone)
• C. RZ
• D. IDZ

Answer: (B)

Base protection around an air base is defined by a Base Defense Zone. This zone is drawn close to the installation and is limited to the engagement envelope of the short-range air defense weapons that defend that base. In other words, only threats within the reach and sensor coverage of those SR systems are engaged within this area, keeping fire control inside the base’s defensive bubble. If a threat lies beyond that envelope, it would fall outside the base’s SR defenses and would be handled by other assets or higher-level defense layers. The other zone concepts describe engagements or defenses with broader scope or different purposes, so they don’t describe the base’s short-range defensive envelope.