Definition of Sigint operational tasking

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Sigint operational tasking Definition from Government Dictionaries & Glossaries
DOD Dictionary of Military Terms
The authoritative operational direction of and direct levying of signals intelligence (SIGINT) information needs by a military commander on designated SIGINT resources. These requirements are directive, irrespective of other priorities, and are conditioned only by the capability of those resources to produce such information. Operational tasking includes authority to deploy all or part of the SIGINT resources for which SIGINT operational tasking authority has been delegated. See also signals intelligence.
  
Source: U.S. Department of Defense, Joint Doctrine Division. ( About )