Same-same
It's still done that way.
In general, "boomers" go on deterrent patrols and attack boats go on deployments; both are normally much longer duration than the wartime Fleet Boat patrols. But, in either case, upon return there will typically be a crew turnover of 25-33%. During the inter-deployment cycle the replacements will be hard at work qualifying.
But then, the old hands are also busy hitting the books too, enlisted and officers. Studying for advancement exams and just generally improving knowledge of the boat never ends.
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