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Noun department of defense has 1 sense
  1. Department of Defense, Defense Department, United States Department of Defense, Defense, DoD - the federal department responsible for safeguarding national security of the UnitedStates; created in 1947
    --1 is a kind of executive department
    --1 has parts:
     Defense Advanced Research Projects Agency, DARPA; Department of Defense Laboratory System, LABLINK; United States Navy, US Navy, USN; United States Air Force, U. S. Air Force, US Air Force, USAF; Defense Intelligence Agency, DIA; Defense Logistics Agency; Defense Technical Information Center, DTIC; National Reconnaissance Office, NRO; National Security Agency, NSA; United States Army, US Army, U. S. Army, USA; Ballistic Missile Defense Organization, BMDO; Defense Information Systems Agency, DISA; National Imagery and Mapping Agency, NIMA; Casualty Care Research Center, CCRC
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