Definition of Principal federal official

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Principal federal official Definition from Government Dictionaries & Glossaries
DOD Dictionary of Military Terms
The federal official designated by the Secretary of Homeland Security to act as his/her representative locally to oversee, coordinate, and execute the Secretary’s incident management responsibilities under Homeland Security Presidential Directive 5 for incidents of national significance. Also called PFO. (JP 3-41)
  
Source: U.S. Department of Defense, Joint Doctrine Division. ( About )