When should the ADCF notify ATC facilities about control of interceptor aircraft under AFIO terms?

The correct choice is that the ADCF (Air Defense Control Facility) should notify ATC (Air Traffic Control) facilities immediately regarding the control of interceptor aircraft under AFIO (Air Force Intercept Operations) terms. This immediate notification is crucial because it ensures that air traffic control has real-time awareness of interceptor operations, which can significantly impact the safety and coordination of airspace management.

Timely communication is essential in military operations, particularly when interceptors are involved, as there may be an immediate need to re-route civilian air traffic or coordinate with other military units. By alerting ATC right away, the ADCF ensures that all parties are aligned, reducing the risk of misunderstandings or dangerous situations arising from a lack of situational awareness.

This prompt notification helps maintain operational integrity and allows ATC to manage the airspace effectively while the interceptors are engaged.