– USNI News – The Navy has selected a design concept to replace its nuclear guided missile submarines (SSGNs). Late last month NAVSEA and the Navy settled on a design concept for the Virginia Payload Module, a $743 million design change in the Virginia-class nuclear attack submarines (SSN-774) that will eventually replace the current Ohio-class SSGNs as part of the Block V iteration of the attack boat. The design will extend the hull by approximately 70 feet to include four so-called Virginia Payload Tubes (VPT) each containing seven Tomahawk Land Attack Missiles (TLAMs).