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Definition of Advance force

Advance force Definition from Government Dictionaries & Glossaries
DOD Dictionary of Military Terms
(*) A temporary organization within the amphibious task force which precedes the main body to the objective area. Its function is to participate in preparing the objective for the main assault by conducting such operations as reconnaissance, seizure of supporting positions, minesweeping, preliminary bombardment, underwater demolitions, and air support.
  
Source: U.S. Department of Defense, Joint Doctrine Division. ( About )