General Dynamics Electric BoatRegardless, the decision to formally recategorize Virginia class submarines with VPMs as SSGNs is significant. Using different inserts, future Virginia class SSGNs will be able to carry other munitions in those tubes. The next generation of Virginia class SSGNs builds on that legacy with greater survivability, adaptability, and sustained combat power.” As noted, some existing Virginia class submarines also perform the special operations support mission, but on a more limited level. If nothing else, the Navy has at least outlined more of a formal plan to supplant the Ohio class SSGNs with what it has now dubbed Virginia class SSGNs.