Military aircraft use "Squawk" codes to communicate information when conducting military operations, with the three main codes being 7500, meaning hijacking; 7600 meaning transmission error and 7700, meaning emergency. The exposed aircraft reportedly transmitted code Squawk 7600, meaning transmission error.
The IDF Spokesperson's Unit commented on the incident, saying that "during a routine training flight in a training area in the South, a malfunction was discovered in the aircraft's transponder.
"In order to communicate with the other aircraft that participating in the training, the pilot activated the aircraft's detection system so that the other aircraft would be able to recognize it without communicating with the pilot," the unit said.
The IDF added that "the tracking system is operated at the discretion of the pilot and the incident was not an exceptional event." Read more at JPost