![]() ![]() Navy refers to this as 3:15.īlock IV will be followed by the Block V configuration which involves 10 boats and may incorporate the Virginia Payload Module (VPM), which would give guided-missile capability when the SSGNs are retired from service. Block IV RTOC efforts are intended to reduce planned availabilities by one to three and increase deployments to 15. The Block III submarines are built with two larger 87-inch diameter tubes able to house six TLAMS each.īlocks I-III Virginias are planned to undergo four depot maintenance availabilities and conduct 14 deployments. The first 10 Block I and Block II Virginia-class submarines have 12 individual 21-inch diameter vertical launch tubes able to fire Tomahawk Land Attack Missiles (TLAMS). The Block III submarines are fitted with the new Virginia Payload Tubes designed to lower costs and increase missile-firing payload possibilities. ![]() USS Delaware (SSN 791), the last and final of eight Block III Virginia-class submarines, was commissioned in April 2020. Navy will increase the periodicity between depot maintenance availabilities and increase the number of deployments. By making these smaller-scale design changes to increase the component-level lifecycle of the submarine, the U.S. About Virginia-class Block IV SSN USS Iowa at christening ceremony (Credit: Office of the Under Secretary of the Navy)īlock IV submarines (SSNs 792 to 801) incorporate design changes focused on reduced total ownership cost (RTOC).
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