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The first Coast Guard presence in the area was a Life Saving Station located on Little Cranberry Island, established by an act of congress on June 18th, 1878.  In 1937, the Southwest Harbor complex was created and used as a lighthouse depot by the U.S. Light House Service.  By 1945, the Coast Guard Station on Little Cranberry Island was moved to the facility in Southwest Harbor.

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Mission requirements expanded from 1945 to 1966 and the CG 'Group' concept was established. The administrative and industrial building was completed in 1966 with a new barracks in 1968.  The barracks was expanded and remodeled in 1984, then subequently renovated in July of 2006.

On June 30th, 2005 Group Southwest Harbor was recommissioned as a Sector Field Office (SFO), a sub-unit under CG Sector Northern New England, with it's own command and operational responsibility.  Exactly one year later, in June of 2006, the SFO transitioned to a logistics and support department of CG Sector Northern New England.


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