| http://www.w3.org/ns/prov#value | - But the U.S. Navy was challenged during the 1980s by much quieter Soviet submarines, by the new tactic of Soviet ballistic missile submarines seeking protection under the polar ice, and by the new ability of Soviet submarines to remain in heavily fortified ???bastions??? ??? areas off the Soviet coast protected by layers of defenses, including the combined operations of air, surface and undersea a
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