Which zone is the base defense zone established around an airbase to defend against threats?

• A. SAAFR Standard-use Army Aircraft Flight Route
• B. BDZ Base defense zone
• C. ROA Restricted operations area
• D. MRR Minimum-risk route

Answer: (B)

A base defense zone is the protective airspace established around an airbase to defend against threats. Its purpose is to provide a defined area where security forces and airspace control can detect, deter, and respond to potential threats to the base, including restricting unauthorized air traffic and coordinating defensive actions.

This concept is distinct from standard-use flight routes, which are planned paths to keep Army aircraft away from other airspace; restricted operations areas, which limit certain activities to protect ongoing missions; and minimum-risk routes, which are chosen to minimize risk to aircraft during flight. The base defense zone specifically focuses on safeguarding the installation itself.