Tactical beacon
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The tactical beacon or TACBE as it is often known has been used by British and American armed 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, 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.
[edit] History
Its most famous use is by the SAS team Bravo Two Zero who, after becoming lost in Iraq and suffering casualties, tried to call in helicopter EVAC or aerial support to no avail.