The Naval Security Group (NAVSECGRU) was an organization within the United States Navy, tasked with intelligence gathering and denial of intelligence to adversaries.
A large part of this is signals intelligence gathering, cryptology and information assurance.
The NAVSECGRU organization was transferred to the Naval Network Warfare Command (NETWARCOM) where its former assets made up the Information Operations Directorate.
[1] The service cryptologic commander role was transferred to United States Tenth Fleet 29 January 2010.
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