Final answer:
Mode 3 of the military IFF system is identical to the civilian IFF Mode A, providing coordination between military and civilian air traffic control.
Step-by-step explanation:
The military identification, friend or foe (IFF) system Mode 3 is identical to the civilian IFF Mode A. This system is used for identifying and tracking aircraft. The military uses several modes, with Mode 3 allowing for aircraft to send a four-digit octal code that can be recognized by both military and civilian systems for air traffic control purposes.
This overlap ensures coordination between military and civilian air traffic controllers, helping to maintain organized and safe airspace operations.