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Definition of Echeloned displacement

Echeloned displacement Definition from Government Dictionaries & Glossaries
DOD Dictionary of Military Terms
(*) Movement of a unit from one position to another without discontinuing performance of its primary function. (DOD only) Normally, the unit divides into two functional elements (base and advance); and, while the base continues to operate, the advance element displaces to a new site where, after it becomes operational, it is joined by the base element.
  
Source: U.S. Department of Defense, Joint Doctrine Division. ( About )