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In page Ohio-class submarine:

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The U.S. Department of Defense anticipated a continued need for a sea-based strategic nuclear force.[citation needed] The first of the current Ohio-class SSBNs was expected to be retired by 2029,[citation needed] so the replacement submarine would need to be seaworthy by that time. A replacement was expected to cost over $4 billion per unit compared to Ohio's $2 billion.[1] The U.S. Navy explored two options. The first option was a variant of the Virginia-class nuclear-powered attack submarines. The second option was a dedicated SSBN, either with a new hull or based on an overhaul of the current Ohio class.[citation needed]