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Definition of Taboo frequencies

Taboo frequencies Definition from Government Dictionaries & Glossaries
DOD Dictionary of Military Terms
Any friendly frequency of such importance that it must never be deliberately jammed or interfered with by friendly forces. Normally, these frequencies include international distress, CEASE BUZZER, safety, and controller frequencies. These frequencies are generally long standing. However, they may be time-oriented in that, as the combat or exercise situation changes, the restrictions may be removed. See also electronic warfare. (JP 3-13.1)
  
Source: U.S. Department of Defense, Joint Doctrine Division. ( About )