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Definition of Parallel chains of command

Parallel chains of command Definition from Government Dictionaries & Glossaries
DOD Dictionary of Military Terms
In amphibious operations, a parallel system of command, responding to the interrelationship of Navy, landing force, Air Force, and other major forces assigned, wherein corresponding commanders are established at each subordinate level of all components to facilitate coordinated planning for, and execution of, the amphibious operation. (JP 3-02.2)
  
Source: U.S. Department of Defense, Joint Doctrine Division. ( About )