Definition of the term 'harbor defense ' per official documentation of the United States Department of Defense.
harbor defense
The defense of a harbor or anchorage and its water approaches against external threats such as: a. submarine, submarine-borne, or small surface craft attack; b. enemy minelaying operations; and c. sabotage. The defense of a harbor from guided missiles while such missiles are airborne is considered to be a part of air defense. See also port security. (US DoD)
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