A navy (or maritime force) is a fleet of waterborne military vessels (watercraft). It is the branch of a nation's armed forces principally designated for naval and amphibious warfare; namely, lake-borne, riverine, littoral, or ocean-borne combat operations and related functions. It includes anything conducted by surface ships, amphibious ships, submarines, and seaborne aviation, as well as ancillary support, communications, training, and other fields; recent developments have included space-related operations. The strategic offensive role of a navy is projection of force into areas beyond a country's shores (for example, to protect sea-lanes, ferry troops, or attack other navies, ports, or shore installations). The strategic defensive purpose of a navy is to frustrate seaborne projection-of-force by enemies. The strategic task of the navy also may incorporate nuclear deterrence by use of nuclear missiles. Naval operations can be broadly divided between riverine and littoral applications (brown-water navy) and open-ocean applications (blue-water navy), although the distinction is more about strategic scope than tactical or operational division
Navy was a military unit composed of various vessels and was commonly known as a Starfleet or a Defense Fleet. Though several worlds and civilizations used the word "Navy" as traditionally associated with a fleet of sea vessels, the majority of the the galaxy primarily used it to define a fleet of starships.

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