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In page Mutual assured destruction:
"The US Department of Defense anticipates a continued need for a sea-based strategic nuclear force.[citation needed] The first of the current Ohio-class SSBNs are expected to be retired by 2029,[citation needed] meaning that a replacement platform must already be seaworthy by that time. A replacement may cost over $4 billion per unit compared to the USS Ohio's $2 billion.[3] The USN's follow-on class of SSBN will be the Columbia class, which began construction in 2021 and enter service in 2031.[4]
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