The branch of a nation's [[military|armed forces]] principally designated for naval and amphibious warfare; namely, lake- or ocean-borne combat operations and related functions

 It includes anything conducted by surface [[warship]]s, amphibious ships, [[submarine|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.
海軍