TACBE
Encyclopedia
The tactical
Military tactics
Military tactics, the science and art of organizing an army or an air force, are the techniques for using weapons or military units in combination for engaging and defeating an enemy in battle. Changes in philosophy and technology over time have been reflected in changes to military tactics. In...

 beacon or TACBE as it is often known has been used by British and American armed forces (usually by Special Forces) for many years. Its primary role is to contact planes or helicopters which may be overhead or nearby.
The system's main use is a distress signal
Distress signal
A distress signal is an internationally recognized means for obtaining help. Distress signals take the form of or are commonly made by using radio signals, displaying a visually detected item or illumination, or making an audible sound, from a distance....

, sending out a constant danger message to AWACS planes. However, it can also be used as a short range communications device with local aircraft. Using it indicates that one is in danger and needs help.
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