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Definition of Sigint direct support unit

Sigint direct support unit Definition from Government Dictionaries & Glossaries
DOD Dictionary of Military Terms
A signals intelligence (SIGINT) unit, usually mobile, designed to perform a SIGINT direct support role for a military commander under delegated authority from the Director, National Security Agency/Chief, Central Security Service. See also signals intelligence.
  
Source: U.S. Department of Defense, Joint Doctrine Division. ( About )