As a goal, an aircraft carrier should be able to do at least 40 knots because it needs that airspeed across its deck to launch planes. The USS Midway was capable of that in the late 70s although you'd think she was coming apart. I'm sure the nuke ships are capable of much more.
"A free people (claim) their rights as derived from the laws of nature, and not as the gift of their chief magistrate."
--Thomas Jefferson, Rights of British America, 1774
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