How many modes of operation do airborne IFF systems provide?

Airborne Identification Friend or Foe (IFF) systems typically provide five modes of operation. These modes serve distinct purposes in identifying and communicating with friendly forces while distinguishing them from potential threats. The first four modes are often associated with different types of military operations and mission requirements, such as interrogation responses from friendly aircraft and radar systems. The fifth mode frequently includes secure communications or additional functionalities that enhance situational awareness and operation in complex environments.

This multi-mode capability is crucial for ensuring effective communication in various combat and non-combat situations, improving safety and operational effectiveness. Understanding these modes is essential for military personnel to effectively utilize IFF systems and to ensure the right responses are generated based on the mode selected.