![]() ![]() ![]() ![]() While the first 10 Block I and Block II Virginia -class submarines feature 12 individual 21-inch diameter vertical launch tubes able to fire Tomahawk Land Attack Missiles (TLAMS), the Block III boats are built with two-larger 87-inch diameter tubes able to house six TLAMS each (…) The new 87-inch tubes have been designed to accommodate future missile systems in addition to the Tomahawk. Virginia-class attack Block III submarines are made with the new Virginia Payload Tubes or Virginia Payload Module (VPM) - two large-diameter tubes that replace 12 individual vertical launch tubes on Block I and Block II boats - designed to lower costs and increase missile-firing payload capabilities. Navy’s Block III fleet will consist of a total of eight submarines. Navy at General Dynamics Electric Boat Shipyard in Groton, Connecticut in September 2018. The boat was christened in October 2017 and delivered to the U.S. The USS South Dakota is the 17th Virginia-class attack submarine and the seventh Virginia-class Block III submarine. Navy commissioned its newest Virginia-class nuclear-powered attack submarine, the future USS South Dakota (SSN 790), during a ceremony at Naval Submarine Base New London in the eastern United States on February 2. ![]()
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