In which NATO operation was airborne early warning aircraft deployed?

The deployment of airborne early warning aircraft is notably associated with Operation Eagle Assist. This operation involved the NATO Alliance providing air surveillance and control over the airspace above the United States following the events of September 11, 2001. The airborne early warning aircraft were used to enhance situational awareness and ensure the safety of airspace in a critical period.

Airborne early warning systems are crucial in detecting, tracking, and identifying potential threats from the air, allowing for prompt and coordinated responses. Although other operations may involve various forms of reconnaissance and surveillance, Operation Eagle Assist specifically employed these aircraft to fulfill its mission objectives, which focused on maintaining air security in response to heightened threats.

In the context of the other options, while Operation Allied Force involved various types of aircraft and military interventions in the Balkans, it did not primarily focus on airborne early warning missions. Similarly, Anchor Guard and Operation Active Endeavour had other operational focuses and did not notably deploy airborne early warning aircraft on the same scale or for the same purpose as Operation Eagle Assist.