High Quality Content by WIKIPEDIA articles! The Benjamin Franklin class of submarine was an evolutionary development from the James Madison class of fleet ballistic missile submarine. Having quieter machinery and other improvements, they are considered a separate class. A subset of this class is the re-engineered 640 class starting with USS George C. Marshall. Together with the George Washington, Ethan Allen, Lafayette, and James Madison classes, they comprised the "41 for Freedom" original 41 fleet ballistic missile submarines. The Benjamin Franklin-class submarines were built with the Polaris A-3 ballistic missile, and later converted to carry the Poseidon C-3. During the late 1970s and early 1980s, selected units were further modified to carry Trident-I ballistic missiles. Two submarines of this class were converted for delivery of special warfare units ashore. In the early 1990s, to make room for the Ohio-class ballistic missile submarines within the limits set by the SALT II strategic arms limitation treaty, the ballistic missile tubes of USS Kamehameha and USS James K. Polk were disabled.

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