How many IFF modes are there in total?

The correct answer is based on the classification of Identification Friend or Foe (IFF) modes used in air defense systems. IFF is critical for distinguishing between friendly and enemy aircraft. There are five recognized modes of IFF. These modes consist of Mode 1, Mode 2, Mode 3/A, Mode 4, and Mode 5. Each mode serves distinct purposes, such as providing different levels of identification and situational awareness.

For instance, Mode 3/A is predominantly used for general air traffic control purposes, while Mode 4 is encrypted and ensures that only friendly forces can identify themselves. Mode 5 enhances security and interoperability among allied forces. The existence of these multiple modes allows for flexibility and improved identification, which is essential for maintaining safety and coordination in shared airspace.

As a result, knowing the five modes helps personnel effectively utilize the IFF systems within air defense operations, enhancing overall mission success while avoiding potential friendly fire incidents.