Which killbox airspace status is established but aircraft are prohibited?

• A. Open
• B. Purple Kill Box
• C. Established but A/C Are Prohibited
• D. Closed

Answer: (C)

Airspace statuses in a kill box tell you whether entry is allowed and under what conditions. When a kill box is established but aircraft are prohibited, the area is active and protected for ongoing operations, but no aircraft may enter unless explicitly authorized. This setup keeps nonparticipant air traffic out during weapons release or high-risk activity, preventing fratricide and ensuring safety for those authorized inside the box.

Open means the area is available for entry under normal clearance. Closed means it’s not available at all. A Purple Kill Box is a specific combined-arms coordination designation and isn’t the same as the general established-but-prohibited status. So the best description for “established but aircraft are prohibited” is exactly that: the box is active, but entry is prohibited for all aircraft not explicitly authorized.